Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f631d3529061413…

MALICIOUS

PDF

60.7 KB Created: 2021-06-16 15:12:50 +03:00 Authoring application: Dorothy Fernandez (via Emily Dunn) First seen: 2021-06-20
MD5: f9c9356b3646d747cfc112c870ebffd2 SHA-1: 4d40370f31f3ca41a0813c43a0c0e568e0f5cec2 SHA-256: 0f631d35290614136618a2e315aea720599aaafd5c2d69575ec1e746ba3bc7e4
84 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is malformed and contains an image-only lure, a common tactic for phishing. It includes external URIs and local builder paths, suggesting an attempt to redirect the user to malicious content. No scripts were extracted, but the structure indicates a likely attempt to exploit the user's trust through a deceptive visual presentation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3363

Heuristics 5

  • Image-only PDF carries local builder path plus remote links high PDF_IMAGE_LURE_LOCAL_FILE_AND_REMOTE_URI
    PDF is an image-only click lure that contains both remote HTTP(S) destinations and a file:/// URI exposing a local Windows/Linux builder path. That co-occurrence is not normal document linking; it matches generated clickbait/phishing carriers where the visible page is a screenshot and the clickable area sends the user to external infrastructure.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 60 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://crrl.asserter.com PDF link annotation

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