sublimemediumRule

Attachment: Encrypted PDF With Credential Harvesting Indicators

Detects encrypted PDF attachments containing patterns and indicators commonly associated with credential harvesting operations, identified through YARA signature analysis.

MITRE ATT&CK

T1566 T1566.001 T1566.002 T1598 T1027 T1573 T1036

defense-evasion

Detection Query

type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            any(.scan.yara.matches, .name in ("pdf_encrypted_cred_phish_001"))
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Attachment: Encrypted PDF With Credential Harvesting Indicators"
description: "Detects encrypted PDF attachments containing patterns and indicators commonly associated with credential harvesting operations, identified through YARA signature analysis."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(filter(attachments, .file_type == "pdf"),
          any(file.explode(.),
              any(.scan.yara.matches, .name in ("pdf_encrypted_cred_phish_001"))
          )
  )
attack_types:
  - "Credential Phishing"
tactics_and_techniques:
  - "Encryption"
  - "Evasion"
  - "PDF"
detection_methods:
  - "File analysis"
  - "YARA"
id: "2122a286-4b6c-5f40-a2cd-2ed02c68baca"