sublimemediumRule

Attachment: PDF with specific W-9 lure

Detects PDF attachments containing W-9 related lures. This one is looking for signatures that have been observed across multiple samples.

MITRE ATT&CK

T1566.002 T1534 T1656 T1566 T1598

initial-access

Detection Query

type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            any(.scan.yara.matches, .name in ("pdf_w9_signature_c003"))
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Attachment: PDF with specific W-9 lure"
description: "Detects PDF attachments containing W-9 related lures. This one is looking for signatures that have been observed across multiple samples."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(filter(attachments, .file_type == "pdf"),
          any(file.explode(.),
              any(.scan.yara.matches, .name in ("pdf_w9_signature_c003"))
          )
  )
attack_types:
  - "BEC/Fraud"
tactics_and_techniques:
  - "PDF"
  - "Social engineering"
detection_methods:
  - "File analysis"
  - "YARA"
id: "531760d2-f7e5-5fa9-9ccf-e5fbdba2a6a3"