Malicious PDF — malware analysis report

Static analysis result for SHA-256 668bf41da1c754d9…

MALICIOUS

PDF

41.2 KB Created: 2020-04-01 20:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 72a6900df7ad26dba93287a7aef1a9d1 SHA-1: 39904f61d25ad72b1aad47932ceb0c445ba477ce SHA-256: 668bf41da1c754d908dc70d27a42c7c92be4c8a2b9fc80026ac64a9a77fbb122
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a common tactic for SEO poisoning or distributing malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document body likely describes changes to payment instructions, a prevalent business email compromise tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://rekazconsult.com/uploads/1/3/0/7/130738841/130738841.html#cori+carl+moving+to+canada
    • http://cambridgeblackcar.com/uploads/1/3/0/6/130639687/7393287.pdf
    • http://creevanracing.com/uploads/1/3/0/6/130621447/ce1ba285d622a.pdf
    • http://wisewomanspiral.com/uploads/1/3/1/1/131163610/vetokixatobel.pdf
    • http://superiortrusses.net/uploads/1/3/0/3/130379135/7512498.pdf
    • http://mynetworkclub.com/uploads/1/3/0/7/130775309/c2f76c.pdf
    • http://alanmaps.com/uploads/1/3/0/9/130969485/wilomeze.pdf
    • http://redalertemergencycards.com/uploads/1/3/0/2/130287295/puvepavikomaxesokoli.pdf
    • http://facethewaste.net/uploads/1/3/0/6/130620834/6242868.pdf
    • http://katoacellars.com/uploads/1/3/1/1/131164435/xafimubanaxurozege.pdf
    • http://moayas.com/uploads/1/3/0/5/130540209/7704301.pdf
    • http://battlecreekendo.com/uploads/1/3/0/4/130488228/ruwiwi.pdf
    • http://aaadev.org/uploads/1/3/0/7/130775889/derugobejiguvun-gezesazirozo-titudora.pdf
    • http://ysbma.com/uploads/1/3/0/2/130289772/4f1a9faf99c.pdf
    • http://itunes.ua.edu/uploads/1/3/0/7/130775520/rixasek-kumasat-saboga-towagilaraxebul.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_off000077c3.bin
58f89b83ac7fd73bedda19f1b90d6126a87712358d0e53176ff2ecf7cab29081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 7844 bytes

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