Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a4efa33d324142…

MALICIOUS

PDF

31.8 KB Created: 2020-05-16 15:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1d87930bccc434c6e9abaa6d94d982 SHA-1: 806fd8d196ab88cb14b08383b83e234dc2d23285 SHA-256: f9a4efa33d324142514e7516800d9734bbc875f5f690b97c918279fc33b06350
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://centerbelarusianstudies.org/uploads/1/3/1/4/131437875/131437875.html#jobstreet+singapore+salary+guide+2018
    • http://robinstevensreps.com/uploads/1/3/1/4/131453021/ruwaxudubik.pdf
    • http://truthaboutkifowit.org/uploads/1/3/0/6/130620401/gofogememusomef.pdf
    • http://bradwarnermedia.com/uploads/1/3/0/7/130775705/1076654.pdf
    • http://projectdataco.com/uploads/1/3/0/5/130550782/a41b9682a859b.pdf
    • http://esqeul.net/uploads/1/3/1/4/131407887/81318a3ae.pdf
    • http://stepmomsassociation.com/uploads/1/3/1/6/131636664/2937861.pdf
    • http://seabrightluxurywaterfront.com/uploads/1/3/0/5/130588352/2383493.pdf
    • http://freeapps-mobilesports.com/uploads/1/3/1/6/131637814/dojoweboti_wovubikuxajepe_nubolo_vutoma.pdf
    • http://fami.studio/uploads/1/3/1/4/131437253/lulos_gudugolaxoj_litaxute.pdf
    • http://strategicogr.online/uploads/1/3/0/5/130552055/pijojow.pdf
    • http://carlosellmotors.com/uploads/1/3/1/3/131379496/9123230.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_off00005113.bin
b03926deccc9d41eb0ea92b7b5422b5b6f961493212734d3d90c67c717c1f306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5113 10272 bytes

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