Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31a54fca9b6e5d6…

MALICIOUS

PDF

35.9 KB Created: 2020-01-16 21:23:51 +03:00 Authoring application: calibre 0.9.2 [http://calibre-ebook.com] (via PoDoFo - http://podofo.sf.net)
MD5: e234bf4199791f3d1c4815bb4cb1f123 SHA-1: 7fb6c12b74c0b88a7cad39a8058ee2e96442d2c6 SHA-256: c31a54fca9b6e5d6802aa49f1f3c7b857b87aa76941dda0f67e9308b79ed0e10
90 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF documents on the domain 'gorillawalker.com'. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute potentially malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8279

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/daily-reflections-for-bar-exam-study-an-inspirational-companion-for.pdf
    • http://www.gorillawalker.com/mississippi-sissy-deckle-edge-hardcover.pdf
    • http://www.gorillawalker.com/advanced-practice-nursing-essentials-for-role-development-2nd-second-edition.pdf
    • http://www.gorillawalker.com/hondos-los-suspiros-spanish-edition-kindle-edition.pdf
    • http://www.gorillawalker.com/water-you-waiting-for-a-kindness-kids-adventure-kindness-kids.pdf
    • http://www.gorillawalker.com/the-lost-child-of-philomena-lee-a-mother-her-son.pdf
    • http://www.gorillawalker.com/the-committee-of-sleep-how-artists-scientists-and-athletes-use.pdf
    • http://www.gorillawalker.com/4-him-chapter-one-a-decade-of-4him.pdf
    • http://www.gorillawalker.com/cape-lives-of-the-eighteenth-century.pdf
    • http://www.gorillawalker.com/windows-10-plain-simple.pdf
    • http://www.gorillawalker.com/where-did-our-love-go-the-rise-and-fall-of.pdf
    • http://www.gorillawalker.com/immigrant-subjectivities-in-asian-american-and-asian-diaspora-literatures.pdf
    • http://www.gorillawalker.com/integrated-mathematics-course-ii.pdf
    • http://www.gorillawalker.com/the-encyclopedia-of-writing-and-illustrating-children-s-books-from.pdf
    • http://www.gorillawalker.com/schumann-s-piano-cycles-and-the-novels-of-jean-paul.pdf
    • http://www.gorillawalker.com/monteverdi.pdf
    • http://www.gorillawalker.com/sprout-helps-out.pdf
    • http://www.gorillawalker.com/the-inuit-imagination-arctic-myth-and-sculpture.pdf
    • http://www.gorillawalker.com/the-new-life-safety-code-how-to-prepare-in-advance.pdf
    • http://www.gorillawalker.com/benjamin-o-davis-jr-american-an-autobiography.pdf
    • http://www.gorillawalker.com/radiologia-pediatrica-spanish-edition.pdf
    • http://www.gorillawalker.com/essential-finance-series-investing-basics.pdf
    • http://www.gorillawalker.com/modern-classics-mister-paradise-and-other-one-act-plays.pdf
    • http://www.gorillawalker.com/probability-and-stochastics-graduate-texts-in-mathematics-vol-261.pdf
    • http://www.gorillawalker.com/appletons-annual-cyclopaedia-and-register-of-important-events-volume-19.pdf
    • http://www.gorillawalker.com/watercolor-painting-a-comprehensive-approach-to-mastering-the-medium.pdf
    • http://www.gorillawalker.com/land-s-end-to-john-o-groats-self-help-cycle.pdf
    • http://www.gorillawalker.com/disorders-of-childhood-development-and-psychopathology.pdf
    • http://www.gorillawalker.com/soul-life-times-music-book-cd-series.pdf
    • http://www.gorillawalker.com/model-reduction-for-circuit-simulation-lecture-notes-in-electrical-engineering.pdf
    • http://www.gorillawalker.com/abbrege-de-la-nouvelle-methode-dans-l-art-d-ecrire.pdf
    • http://www.gorillawalker.com/lives-o9f-the-hunted.pdf
    • http://www.gorillawalker.com/kilimanjaro-summit-of-africa.pdf
    • http://www.gorillawalker.com/a-beautiful-cruel-country.pdf
    • http://www.gorillawalker.com/ruins-of-the-wild-dungeon-tiles-4-dungeons-dragons-fantasy.pdf
    • http://www.gorillawalker.com/national-geographic-july-1987-vol-172-no-1.pdf
    • http://www.gorillawalker.com/the-greatest-dukan-diet-in-history-delicious-recipes-that-will.pdf
    • http://www.gorillawalker.com/the-bremen-town-musicians.pdf
    • http://www.gorillawalker.com/wet-riding-hood-a-parody-lesbian-watersports-fantasy.pdf
    • http://www.gorillawalker.com/estambul-istanbul-spanish-edition.pdf
    • 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#
    • http://www.aiim.org/pdfa/ns/property#
    +1 more URL(s)

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