sublimehighRule

Attachment: PDF Grant Payment lure with embedded link

Inbound messages carrying a PDF attachment that references a 'Grant Payment Development' RFP or bid solicitation, often sent from compromised or spoofed education-sector (.k12, .esc) accounts. The PDF contains an embedded URL, consistent with a redirect to a credential-harvesting or malicious landing page disguised as bid documentation.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598

initial-access

Detection Query

type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            strings.icontains(.scan.strings.raw, 'Grant Payment Development')
        )
        and any(file.explode(.), length(.scan.url.urls) > 0)
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Attachment: PDF Grant Payment lure with embedded link"
description: "Inbound messages carrying a PDF attachment that references a 'Grant Payment Development' RFP or bid solicitation, often sent from compromised or spoofed education-sector (.k12, .esc) accounts. The PDF contains an embedded URL, consistent with a redirect to a credential-harvesting or malicious landing page disguised as bid documentation."
type: "rule"
severity: "high"
source: |
  type.inbound
  and any(filter(attachments, .file_type == "pdf"),
          any(file.explode(.),
              strings.icontains(.scan.strings.raw, 'Grant Payment Development')
          )
          and any(file.explode(.), length(.scan.url.urls) > 0)
  )
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "PDF"
  - "Social engineering"
detection_methods:
  - "File analysis"
  - "URL analysis"
  - "Content analysis"
id: "6cbbc908-5492-5ab5-af4f-6d3aa22205cf"