Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ff705b7f3526a5…

MALICIOUS

PDF

38.5 KB Created: 2018-12-28 08:55:04 +03:00 Authoring application: Pdf995 (via GNU Ghostscript 7.05)
MD5: 54391fd25298637afa336ecf86eae403 SHA-1: 95446b560d7233b26c7ca666d78fb8baac1f3892 SHA-256: 61ff705b7f3526a5c67b41eab17d4e1e6d4913174a1b588e62214816601e3539
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF documents, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the document as malicious. The primary purpose appears to be to drive traffic to these external links, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9526

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/u-s-history-skillbook-with-writing-instruction-and-practice.pdf
    • http://www.gorillawalker.com/process-management-for-the-extended-enterprise-organizational-and-ict-networks.pdf
    • http://www.gorillawalker.com/assembly-language-for-intel-based-computers-5th-edition.pdf
    • http://www.gorillawalker.com/hand-book-of-life-and-accident-insurance-on-the-mutual.pdf
    • http://www.gorillawalker.com/vimalakirti-nirdesa-sutra-the-clear-light-series.pdf
    • http://www.gorillawalker.com/vocabulary-connections-level-h-steck-vaughn-vocabulary-connections.pdf
    • http://www.gorillawalker.com/el-color-de-tus-ojos-deseo-spanish-edition.pdf
    • http://www.gorillawalker.com/disaster-recovery-second-edition.pdf
    • http://www.gorillawalker.com/oral-and-maxillofacial-surgery-clinical-practice-manual.pdf
    • http://www.gorillawalker.com/can-omega-3-oils-stop-prostate-enlargement-helps-protect-your.pdf
    • http://www.gorillawalker.com/blue-ribbon-trail-ride-horses-and-friends.pdf
    • http://www.gorillawalker.com/getting-to-know-lego-mindstorms-code-power-a-teen-programmer.pdf
    • http://www.gorillawalker.com/minuet-and-trio-from-water-music-french-horn-solo-and.pdf
    • http://www.gorillawalker.com/canterbury-tales-everyman-s-library-poetry-the-drama-no-307.pdf
    • http://www.gorillawalker.com/fundamentals-of-discrete-structures-2nd-edition.pdf
    • http://www.gorillawalker.com/the-eighth-dragon-birth-of-the-guardian.pdf
    • http://www.gorillawalker.com/fiber-optic-sensing-and-imaging.pdf
    • http://www.gorillawalker.com/snowmobile-and-atv-accident-investigation-and-reconstruction-second-edition.pdf
    • http://www.gorillawalker.com/seashells-2000-calendar.pdf
    • http://www.gorillawalker.com/cuffsy-wuffsy-volume-25.pdf
    • http://www.gorillawalker.com/ultimate-boarding-a-snowboarding-calendar-for-1998.pdf
    • http://www.gorillawalker.com/collins-english-dictionary-kindle-edition.pdf
    • http://www.gorillawalker.com/the-abduction-from-the-seraglio-kalmus-edition.pdf
    • http://www.gorillawalker.com/i-only-want-what-s-best-for-you-a-parent.pdf
    • http://www.gorillawalker.com/japanese-army-in-world-war-ii-conquest-of-the-pacific.pdf
    • http://www.gorillawalker.com/snow-toward-evening-a-year-in-a-river-valley-nature.pdf
    • http://www.gorillawalker.com/soldiers-in-fur-and-feathers-the-animals-that-served-in.pdf
    • http://www.gorillawalker.com/coal-21st-century-skills-library-power-up-kindle-edition.pdf
    • http://www.gorillawalker.com/a-thousand-names-for-joy-living-in-harmony-with-the.pdf
    • http://www.gorillawalker.com/wind-that-shakes-the-barley-the-a-screenplay.pdf
    • http://www.gorillawalker.com/principles-of-corrosion-engineering-and-corrosion-control.pdf
    • http://www.gorillawalker.com/color-influencing-form-a-color-coursebook.pdf
    • http://www.gorillawalker.com/the-manly-eunuch-masculinity-gender-ambiguity-and-christian-ideology-in.pdf
    • http://www.gorillawalker.com/jewish-run-concentration-camps-in-the-soviet-union.pdf
    • http://www.gorillawalker.com/count-your-chickens-yellow-umbrella-early-level.pdf
    • http://www.gorillawalker.com/testing-of-asic-and-fpga-circuits-vlsi-testing-and-verification.pdf
    • http://www.gorillawalker.com/travels-of-a-photographer-in-china-1933-1946.pdf
    • http://www.gorillawalker.com/technic-is-fun-book-4-late-intermediate-hirschberg.pdf
    • http://www.gorillawalker.com/bent-over-his-desk-hot-office-kink.pdf
    • http://www.gorillawalker.com/beijing-china-guide-to-the-international-city.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://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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