Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b67220a07a86baa…

MALICIOUS

PDF

38.7 KB Created: 2020-03-17 09:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 302e573b7d4c94af8e6c52470d8446b0 SHA-1: cb8c7db11a0df2a0e81a480dfcc20284e25ccd55 SHA-256: 7b67220a07a86baa92608a71160e142d71dc9327f27f75240bdbef3013ab1053
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains URLs pointing to external PDF files. This indicates the primary function of this document is to act as a link farm, likely for SEO manipulation or to distribute further malicious content. 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://atpforlife.org/uploads/1/3/0/4/130489361/130489361.html#derivative+of+arctan+2x
    • http://nocompromisecustoms.com/uploads/1/3/0/2/130289218/bivezekojaxam-durowosizobises-kimezopo.pdf
    • http://www.marmaladedental.com/uploads/1/3/0/7/130776060/5452092.pdf
    • http://expressionismabstract.com/uploads/1/3/0/6/130639140/fidabe_sibokuvim_bodaf_zigimur.pdf
    • http://joeandbudstowing.com/uploads/1/3/0/4/130489102/tejebu.pdf
    • http://northshoreengineeringny.com/uploads/1/3/0/7/130740444/xesiga_fujudilujo_pujipisenolo_zuzuvefomu.pdf
    • http://www.purplesprinklesconfectionery.com/uploads/1/3/0/4/130489572/3480475.pdf
    • http://www.4mycpap.com/uploads/1/3/0/6/130639914/kepamatad_sizulos_botixokug.pdf
    • http://mybaremelanin.com/uploads/1/3/0/4/130488736/d20dfa93b961a.pdf
    • http://highfivecap.com/uploads/1/3/0/4/130476597/653cbd28.pdf
    • http://granvillebates.com/uploads/1/3/0/4/130483230/fa304bec33.pdf
    • http://naturetherapycic.com/uploads/1/3/0/5/130589219/9763420.pdf
    • http://bighousesgroup.org/uploads/1/3/0/7/130740490/e8c21fb2c51.pdf
    • http://mta-sts.mail.kdbug.com/uploads/1/3/0/3/130323329/9206119.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_off00006e1b.bin
fe309a238363443192e9003a7c6294c4c5e43c88d4016ca62b2f7a2c68a8780c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1B 8376 bytes

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