Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbed497276001542…

MALICIOUS

PDF

33.1 KB Created: 2019-12-14 01:12:50 +03:00 Authoring application: SYSTEM400 Rev 16.02 (via Acrobat Distiller 4.05 for Windows, Powered by PDF Polisher Pro 5.01 420) First seen: 2020-12-28
MD5: 30f0bbc5c424de65a410549a0386a9e9 SHA-1: 7b72b61552ad36d6d60f92716e5ba3771b6115e8 SHA-256: bbed49727600154205d3a227652caf510c83c690f6fdc55e564a5b5ebe0fbd54
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious. The primary attack pattern observed is the distribution of numerous links, likely to establish a link farm or to serve as a lure for users to download additional content.

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/haydn-two-other-cadenzas-to-haydn-concerto-for-piano-in.pdf In PDF document text
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    • http://www.gorillawalker.com/on-the-ice-an-intimate-portrait-of-life-at-mcmurdo.pdfIn PDF document text
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    • http://www.gorillawalker.com/microbiologia-y-enfermedades-infecciosas-veterinarias-spanish-edition.pdfIn PDF document text
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    • http://www.gorillawalker.com/prince-aladdin-s-harem-an-erotic-fairy-tale-foxy-fairy.pdfIn PDF document text
    • http://www.gorillawalker.com/vanquish.pdfIn PDF document text
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    • http://www.gorillawalker.com/road-to-hana-hana-cd-guide-hana-cd-and-hana.pdfIn PDF document text
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    • http://www.gorillawalker.com/the-neighborhood-kindle-edition.pdfIn PDF document text
    • http://www.gorillawalker.com/cessna-aircraft-images-of-aviation.pdfIn PDF document text
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    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://www.aiim.org/pdfa/ns/extension/In PDF document text
    • http://www.aiim.org/pdfa/ns/schema#In PDF document text
    • http://www.aiim.org/pdfa/ns/property#In PDF document text
    • http://www.aiim.org/pdfa/ns/id/In PDF document text