Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3a799152c83d0c…

MALICIOUS

PDF

45.3 KB Created: 2018-12-07 18:28:14 +03:00 Authoring application: Acrobat 5.0 Scan Plug-in for Windows (via Adobe PDF Library 5.0.2)
MD5: 51dcfcc44abd43caf25c6a1adfc36016 SHA-1: 0517c546d4884c7b3718542d85bc1dcce4c1a976 SHA-256: 4a3a799152c83d0ca863ecbdf9161ae3d347377a4153b3c4c6216a25294a7581
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9005

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://www.gorillawalker.com/esidarap-the-end-of-magic.pdf
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    • http://www.gorillawalker.com/lone-wolf-cub-volume-13.pdf
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    • http://www.gorillawalker.com/joining-and-assembly-of-medical-materials-and-devices-woodhead-publishing.pdf
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    • http://www.gorillawalker.com/dark-marco-vol-2-kindle-edition.pdf
    • http://www.gorillawalker.com/atlas-geograficzny-polish-edition.pdf
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    • http://www.gorillawalker.com/yamaha-xj900s-diversion-service-and-repair-manual-1994-2000-haynes.pdf
    • http://www.gorillawalker.com/uhlig-s-corrosion-handbook-the-ecs-series-of-texts-and.pdf
    • http://www.gorillawalker.com/the-calculus-of-selfishness-princeton-series-in-theoretical-and-computational.pdf
    • http://www.gorillawalker.com/whole-gospel-whole-world-the-foreign-mission-board-of-the.pdf
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    • http://www.gorillawalker.com/histoire-de-nicolas-i-roy-du-paraguai-et-empereur-des.pdf
    • http://www.gorillawalker.com/the-helicopter-pilot-s-manual-volume-2-powerplants-instrumen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/

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