Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5e148c6b397506…

MALICIOUS

PDF

34.2 KB Created: 2019-05-24 00:42:49 +03:00 Authoring application: AH XSL Formatter V6.1 MR5a for Windows (x64) : 6.1.10.15867 (via Antenna House PDF Output Library 6.1.472 (Windows (x64)))
MD5: 7b83ab0b0f25b5741f755bfb7db9d00e SHA-1: 6c435742d457b7114371c89fc297d353e579d5a2 SHA-256: bd5e148c6b3975060420d06b6580dcdc49adbb9ea95f7f6deb54b968c40cd8ed
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and contains a significant number of embedded external links to other PDF files hosted on the same domain. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier's high score further supports the malicious nature of the file. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8529

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/physical-diagnosis-secrets-1e.pdf
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    • http://www.gorillawalker.com/the-chronological-collection-of-the-kings-of-denmark.pdf
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    • 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/