Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a728a4aadf89d2…

MALICIOUS

PDF

39.8 KB Created: 2018-11-23 08:00:28 +03:00 Authoring application: - (via Acrobat Distiller 4.05 for Windows)
MD5: f3c9e05c166c429fd70067e116048327 SHA-1: 1b91d53e4b9061ec23e95afd91b48801a22c1127 SHA-256: 51a728a4aadf89d2ba50a003c30df28424d68a9d7746b3aa90a4715c948d3588
150 Risk Score

Malware Insights

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

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 ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic 'PDF_SEO_LINK_FARM' and the sheer volume of links to 'www.gorillawalker.com' are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

Heuristics 3

  • 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.
  • ClamAV: Pdf.Dropper.Agent-7260166-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7260166-0
  • 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/world-war-ii-shipyards-by-the-bay-ca-images-of.pdf
    • http://www.gorillawalker.com/national-geographic-july-1976-vol-150-no-1.pdf
    • http://www.gorillawalker.com/devil-s-despair.pdf
    • http://www.gorillawalker.com/the-complete-guide-to-potty-training-children-new-sure-fire.pdf
    • http://www.gorillawalker.com/keeping-sweets.pdf
    • http://www.gorillawalker.com/vintage-vocal-piano-sheet-music-blue-danube-robbins-royal-edition.pdf
    • http://www.gorillawalker.com/a-question-of-time-j-r-r-tolkien-s-road.pdf
    • http://www.gorillawalker.com/theirs-to-keep-tangled-hearts-trilogy-book-1.pdf
    • http://www.gorillawalker.com/chasing-the-ripper.pdf
    • http://www.gorillawalker.com/catalogue-of-printed-books-including-science-and-medicine-mar-31.pdf
    • http://www.gorillawalker.com/chronicle-books-mastering-the-art-of-embroidery-tutorials-techniques-and.pdf
    • http://www.gorillawalker.com/hot-rocks.pdf
    • http://www.gorillawalker.com/xtreme-drums-book-and-cd.pdf
    • http://www.gorillawalker.com/biro-kindle-edition.pdf
    • http://www.gorillawalker.com/the-developing-labor-law-the-board-the-courts-and-the.pdf
    • http://www.gorillawalker.com/focused-ion-beam-systems-basics-and-applications.pdf
    • http://www.gorillawalker.com/solar-energy-innovative-technologies.pdf
    • http://www.gorillawalker.com/boston-pocket-guide-3rd-edition.pdf
    • http://www.gorillawalker.com/4-wheel-freedom-the-art-of-off-road-driving-by.pdf
    • http://www.gorillawalker.com/reading-grade-3-standards-based-connections.pdf
    • http://www.gorillawalker.com/renraku-arcology-shadowrun.pdf
    • http://www.gorillawalker.com/enchanted-kingdom-troubador-color-story-album.pdf
    • http://www.gorillawalker.com/warigami-combined-arms-origami.pdf
    • http://www.gorillawalker.com/medical-terminology-350-learning-guide.pdf
    • http://www.gorillawalker.com/decisiones-dif-ciles-spanish-edition.pdf
    • http://www.gorillawalker.com/the-traveller-s-guidebook-for-everyone-let-s-go-to.pdf
    • http://www.gorillawalker.com/planning-guide-for-maintaining-school-facilities.pdf
    • http://www.gorillawalker.com/josh-smith-hidden-darts-reader.pdf
    • http://www.gorillawalker.com/two-voices-one-song-creative-arrangements-of-classic-hymns-for.pdf
    • http://www.gorillawalker.com/the-history-of-the-council-of-florence-classic-reprint.pdf
    • http://www.gorillawalker.com/thomas-jefferson-philosopher-of-freedom.pdf
    • http://www.gorillawalker.com/the-sugar-frosted-nutsack-a-novel.pdf
    • http://www.gorillawalker.com/note-on-the-spinal-portion-of-some-ascending-degenerations.pdf
    • http://www.gorillawalker.com/homeopathic-psychiatry.pdf
    • http://www.gorillawalker.com/jack-london-writer-of-adventure.pdf
    • http://www.gorillawalker.com/shifting-into-overdrive-dawson-s-creek-3.pdf
    • http://www.gorillawalker.com/netter-s-advanced-head-neck-flash-cards-netter-basic-science.pdf
    • http://www.gorillawalker.com/alexander-the-great-man-and-god.pdf
    • http://www.gorillawalker.com/history-of-sanskrit-poetics.pdf
    • http://www.gorillawalker.com/diary-of-a-drag-queen.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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