Malicious PDF — malware analysis report

Static analysis result for SHA-256 821643aaf716e9bf…

MALICIOUS

PDF

111.5 KB Created: 2021-05-23 14:49:53 +03:00 Authoring application: Kevin Chavez (via Peter Little) First seen: 2021-05-29
MD5: 925e1ffe730a4b1baec713d3077f8e20 SHA-1: 0d96580c7edcb959e61920b972b6efac62a2e671 SHA-256: 821643aaf716e9bf7e4de41947d83671ed089bea5f780e5d8afbc9d52bcbc7c0
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, designed to trick users into interacting with a malicious link. The heuristic 'PDF_IMAGE_LURE' indicates a common phishing tactic where a screenshot is presented as the document content, hiding a clickable element. The embedded URL 'http://8yu4bix.recyclestaunton.com' is the primary indicator of compromise, likely serving as the destination for the user's click.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4314

Heuristics 4

  • 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.
  • 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 111 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://8yu4bix.recyclestaunton.com PDF link annotation

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