Malicious PDF — malware analysis report

Static analysis result for SHA-256 85376cbfc7ffb944…

MALICIOUS

PDF

37.7 KB Created: 2020-03-29 11:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6950d4cbc29ca130a253c06a79c35665 SHA-1: 0c607bcaf1028ca4513354ab37d8c1d18534a8a7 SHA-256: 85376cbfc7ffb944bc43774b66b57cbed36457352a0af362d751944fd50158cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs suggests an attempt to distribute further malicious content or engage in phishing. No scripts were extracted, but the PDF structure itself is indicative of a link farm or redirection attack.

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://74-123-76-48.mgwnet.com/uploads/1/3/0/2/130287537/130287537.html#cheat+for+pokemon+emerald+walk+through+walls
    • http://fetchllc.com/uploads/1/3/1/3/131398379/6206758.pdf
    • http://streamlinelogistics.net/uploads/1/3/0/6/130621709/2136583.pdf
    • http://bhelandscaping.com/uploads/1/3/0/9/130969129/9251982.pdf
    • http://gosecco.com/uploads/1/3/0/7/130738614/945eb7b8efa.pdf
    • http://appleshaw.net/uploads/1/3/0/7/130775615/tulenu.pdf
    • http://robsinc.com/uploads/1/3/0/5/130588272/9371405.pdf
    • http://ebkevents.com/uploads/1/3/0/3/130313167/2827471.pdf
    • http://kipart.org/uploads/1/3/0/6/130620401/3296160.pdf
    • http://efficientengineco.com/uploads/1/3/1/0/131069970/rajugawulum.pdf
    • http://proorganizerslv.com/uploads/1/3/0/9/130969923/5171e87b70e75e8.pdf
    • http://colorthisonlinelife.com/uploads/1/3/0/2/130288602/silutisijuw.pdf
    • http://fareharborsandbox.com/uploads/1/3/0/5/130589312/8433672.pdf
    • http://truentertainmentrecords.com/uploads/1/3/0/7/130776693/kunilabul.pdf
    • http://adelaidequalitytrailers.net/uploads/1/3/0/6/130604014/miputok.pdf
    • http://myaveragewife.com/uploads/1/3/0/4/130476141/26caf2.pdf
    • http://sugarushseacliff.com/uploads/1/3/0/4/130483680/8fa2fd44f1f3690.pdf
    • http://hunnycombevents.com/uploads/1/3/1/3/131383377/3c71dc206e095.pdf
    • http://propertyminds.org/uploads/1/3/1/1/131164218/7383348.pdf
    • http://www.mail.rainiernetworks.com/uploads/1/3/0/6/130639309/5533237.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_off00006ab4.bin
463b3ae8877635be2f3687d3210c36058e0a6cd20fce6f27dbd8ccf9a14217bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 7832 bytes

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