Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ed6ccb1dcc8c9b…

MALICIOUS

PDF

33.7 KB Created: 2019-12-14 04:34:39 +03:00 Authoring application: calibre 0.9.10 [http://calibre-ebook.com] (via PoDoFo - http://podofo.sf.net)
MD5: e6a42b87c9c9934188d7b7d69b6e7a2c SHA-1: 446b2b68c4e6887435e3ff684e917d14b648a81a SHA-256: 89ed6ccb1dcc8c9b66addf33f62991428f0411b034f5a5f0fde00094fa47e937
90 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the document as malicious. The primary attack pattern appears to be a link farm designed to manipulate search engine results or distribute a high volume of content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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/weathering-rock.pdf
    • http://www.gorillawalker.com/cobbett-s-cyclopedic-survey-of-chamber-music-volume-3-supplement.pdf
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    • http://www.gorillawalker.com/the-badminton-library-golf-the-history-of-golf-kindle-edition.pdf
    • http://www.gorillawalker.com/paralegal-online-courses-family-law-on-blackboard-printed-access-card.pdf
    • http://www.gorillawalker.com/critical-care-nursing-diagnosis-and-management-7e-thelans-critical-care.pdf
    • http://www.gorillawalker.com/mechanisms-in-world-and-mind-perspective-dualism-systems-theory-neuroscience.pdf
    • http://www.gorillawalker.com/the-byzantine-wall-paintings-of-crete-art.pdf
    • http://www.gorillawalker.com/el-abc-de-la-administracion-de-pro
    • 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://calibre-ebook.com
    • http://ns.adobe.com/pdf/1.3/
    • http://podofo.sf.net
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    +2 more URL(s)