sublimemediumRule

Attachment: Fake PDF Invoices Yara

These yara signatures match fake invoice PDFs with specific artifiacts including images and link locations.

MITRE ATT&CK

T1566.001 T1204.002 T1486 T1566 T1566.002 T1598

initial-access

Detection Query

type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            any(.scan.yara.matches,
                .name in (
                  "fake_invoice_pdf_structure_01",
                  "fake_invoice_pdf_images_01",
                )
            )
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Attachment: Fake PDF Invoices Yara"
description: "These yara signatures match fake invoice PDFs with specific artifiacts including images and link locations. "
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(filter(attachments, .file_type == "pdf"),
          any(file.explode(.),
              any(.scan.yara.matches,
                  .name in (
                    "fake_invoice_pdf_structure_01",
                    "fake_invoice_pdf_images_01",
                  )
              )
          )
  )
attack_types:
  - "Malware/Ransomware"
  - "Credential Phishing"
tactics_and_techniques:
  - "PDF"
  - "Social engineering"
detection_methods:
  - "Content analysis"
  - "File analysis"
  - "YARA"
id: "5e006046-12cd-567c-8070-d1c251ccb512"