Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c596b7f44c8f4cd…

MALICIOUS

PDF

42.0 KB Created: 2018-11-23 08:00:37 +03:00 Authoring application: PrimoPDF http://www.primopdf.com (via Nitro PDF PrimoPDF)
MD5: 9eed1b6c36b2bf4c99c8b80d81022c2c SHA-1: 5ffcf6c8819ea9e87b55965044141ad99877ac52 SHA-256: 0c596b7f44c8f4cd3475b96ad2544899812ddb9b2ab14da387f46153d20bf308
152 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. ClamAV detected this file as Pdf.Dropper.Agent-7196794-0, and a machine learning classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly suggest a malicious dropper or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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-7196794-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7196794-0
  • 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/strength-training-for-fat-loss.pdf
    • http://www.gorillawalker.com/welcome-baby-jesus-advent-and-christmas-reflections-for-families-english.pdf
    • http://www.gorillawalker.com/the-ghostway-a-harper-novel-of-suspense.pdf
    • http://www.gorillawalker.com/4-cd-set-for-music-a-social-experience.pdf
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    • http://www.gorillawalker.com/all-through-the-night-kindle-edition.pdf
    • http://www.gorillawalker.com/renoir-impressionism-and-full-length-painting-hardcover.pdf
    • http://www.gorillawalker.com/forever-unsheathed-12-erotic-short-stories-sexy-stories-collection-book.pdf
    • http://www.gorillawalker.com/a-unified-approach-to-subchapters-k-s-american-casebook-series.pdf
    • http://www.gorillawalker.com/crosscurrents-international-development.pdf
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    • http://www.gorillawalker.com/human-dignity-in-bioethics-and-biolaw.pdf
    • http://www.primopdf.com
    • 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/