Malicious PDF — malware analysis report

Static analysis result for SHA-256 a888f3da7a71c7fb…

MALICIOUS

PDF

28.5 KB Created: 2020-06-16 17:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d57f465475d47bd5bd180bbef8b9a2 SHA-1: e5263d23c05889500e66a974d48ee480af160a77 SHA-256: a888f3da7a71c7fb1f133f8a34cf5f071ddf4ee64bd4b0703c482f49d9a1bb22
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to these external resources, which likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://encore00034.voyagerwebsites.com/uploads/1/3/0/4/130488217/130488217.html#windsor+chariot+iscrub+20+parts+manual
    • http://pranaessentialoils.com/uploads/1/3/1/4/131482893/4016493.pdf
    • http://konsumit.com/uploads/1/3/0/3/130323672/3731124.pdf
    • http://bitsofbytes.co.uk/uploads/1/3/1/1/131164542/fef89e264b.pdf
    • http://spearandarrow.com/uploads/1/3/0/3/130323674/pesasegisogawomodifa.pdf
    • http://live3n1.com/uploads/1/3/0/2/130272424/5c7a00fc233.pdf
    • http://mrsscunningham.com/uploads/1/3/0/6/130621317/2668910.pdf
    • http://hostmaster.cystitiscure.co.uk/uploads/1/3/0/7/130774999/3d30d51.pdf
    • http://pprwa.org/uploads/1/3/0/6/130640110/wiwenebijosuxiliwan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045ff.bin
44657d944c7201d49c3091ac82af3ae1dcce94dcdbbd3b6ad61ca09142488cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45FF 9216 bytes

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