Malicious PDF — malware analysis report

Static analysis result for SHA-256 a534eb38b44eda49…

MALICIOUS

PDF

39.2 KB Created: 2020-05-17 18:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76731ff240fd23dafa9023eacfb6e2e SHA-1: 02df2276f9e662a85932a651581af176ea194a73 SHA-256: a534eb38b44eda49a9bb15f0209db3aa5079b37202ab695885a09e595ea06101
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDFs hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a coordinated effort to distribute content across multiple domains, likely for SEO manipulation or to host malicious payloads. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://fishermansclub.org/uploads/1/3/0/6/130621587/130621587.html#queen+bee+images
    • http://topcleanmex.net/uploads/1/3/0/6/130620878/wovogefezugijo_zonesaralis.pdf
    • http://christopherdexter.com/uploads/1/3/0/4/130483417/siluxumuxigokuduz.pdf
    • http://foundgeneration.net/uploads/1/3/0/9/130969327/tifuxatubuxebobu.pdf
    • http://ktownlocksmith.com/uploads/1/3/0/4/130483512/6c5d2e8adf0d77d.pdf
    • http://rivierapsychotherapy.com/uploads/1/3/0/7/130738715/ralawuzodikig.pdf
    • http://yourassisgrassmovie.com/uploads/1/3/1/4/131407423/toxuzivurujutof.pdf
    • http://telemetrysolutions.org/uploads/1/3/1/3/131398419/puditijene.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_off00006cdc.bin
e00c1cddba3ae787dfd24c6f32409d09c79b13b8707a3c3f619ae928d3911df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 11036 bytes

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