Malicious PDF — malware analysis report

Static analysis result for SHA-256 405b739c6570b8bc…

MALICIOUS

PDF

38.6 KB Created: 2020-06-05 23:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde7baf57eeb1e271d0616b250c66b91 SHA-1: d6029612827bcc1b0f315b66308b7345aef516f5 SHA-256: 405b739c6570b8bc7f5d3a3b1b3c582e7a802b68bc3e0052cda54d8c8380d817
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is indicative of a link farm or SEO spam attack. The document body, though partially corrupted, contains text related to a 'Saleen mustang value guide' and embedded URLs, suggesting a lure to external content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://djaccountingservices.com/uploads/1/3/0/6/130604319/130604319.html#saleen+mustang+value+guide
    • http://votebobz.com/uploads/1/3/1/4/131437984/darejize.pdf
    • http://nesherco.com/uploads/1/3/0/4/130476396/gowugu.pdf
    • http://bskbike.com/uploads/1/3/0/7/130775328/8784177.pdf
    • http://mail.xelkom.org/uploads/1/3/1/8/131871633/33b66971595.pdf
    • http://101ksavings.com/uploads/1/3/1/3/131384374/nilumoviburok.pdf
    • http://adsl-64-169-66-166.millerpac.com/uploads/1/3/0/4/130435888/nuduk.pdf
    • http://madamedocura.net/uploads/1/3/0/5/130589137/6100651.pdf
    • http://yulyphotography.com/uploads/1/3/0/2/130289235/mozanevujaxesovon.pdf
    • http://naturalhairstudio.net/uploads/1/3/0/7/130775195/lijavowewerexig.pdf
    • http://anaconstruction.trustabiz.com/uploads/1/3/0/4/130436028/b43b960.pdf
    • http://djaccountingservices.com/uploads/1/3/0/6/130604319/terms.html
    • http://djaccountingservices.com/uploads/1/3/0/6/130604319/dmca.html
    • http://djaccountingservices.com/uploads/1/3/0/6/130604319/policy.html
    • https://lilasipuga.files.wordpress.com/2020/06/738978221.pdf
    • https://ruletiw.files.wordpress.com/2020/06/xafan.pdf
    • https://xumufikok.files.wordpress.com/2020/06/sipenan.pdf
    • https://limigit.files.wordpress.com/2020/06/safamuruzegemujarivebiwu.pdf
    • https://matuwakena.files.wordpress.com/2020/06/lepubujemosatawufobiguv.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_off000069b8.bin
055124585a744484ecc4bd4d90fdd7445548781c2f947dd3937fdc703fb7db64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 10748 bytes

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