Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36ae6eff7ce522c…

MALICIOUS

PDF

36.2 KB Created: 2020-03-29 14:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb14d6bb4e8caf92955334a42fd3dfad SHA-1: 7f3f44fdb1b83f8554042fa5241da57f93e0c8e4 SHA-256: c36ae6eff7ce522cd2bafc7b2ca6993570ef1308d63d742bb7df2f0ec2df9826
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://treeservicessc.com/uploads/1/3/0/6/130604630/130604630.html#apec+essence+roes-50
    • http://furryfriendspetexpo.org/uploads/1/3/1/3/131384424/vuduvibedu.pdf
    • http://karstonchong.com/uploads/1/3/0/3/130313605/a262fb25398da.pdf
    • http://dogoodnyc.com/uploads/1/3/0/5/130539130/5583624.pdf
    • http://michellestevenson.net/uploads/1/3/0/6/130620660/dowipuvaruwif_donobisexeb_jojarojozi_tedezowatolowus.pdf
    • http://destinyusaleggings.com/uploads/1/3/0/7/130738870/gatow.pdf
    • http://mirrorpayroll.net/uploads/1/3/0/4/130435602/nuxibapew.pdf
    • http://starwarscamps.com/uploads/1/3/0/6/130621002/d7b2e9dbbf4.pdf
    • http://aviplan.org/uploads/1/3/0/4/130488946/8deceb941.pdf
    • http://whoabroke.net/uploads/1/3/0/8/130874669/nifepija.pdf
    • http://shrugrepublic.com/uploads/1/3/0/2/130291624/lujekofotad-gawumedu.pdf
    • http://blacksfamily.info/uploads/1/3/0/7/130739415/c6a0c2d79b.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_off000064b2.bin
e7e978f1bca4b8e08a94a749daadb6b14ee98ca26ecfdc0efdbe01c4b1463297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B2 7696 bytes

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