Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acf6019c462c3ee…

MALICIOUS

PDF

38.8 KB Created: 2020-06-01 21:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9506e929ce28e5c06cf6e84ccd576d6a SHA-1: 4305c159f711b90349db19df84073243b9a51ac6 SHA-256: 7acf6019c462c3eec96f990ff320da19404e3f25dbab7d46b202305a235c3816
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://allthingsyogi.net/uploads/1/3/1/3/131379211/131379211.html#kent+hydraulic+breaker+service+manual
    • http://fencingokc.com/uploads/1/3/0/5/130589058/effa59fa594aa.pdf
    • http://floridahospitalityllc.org/uploads/1/3/0/7/130775865/dc2edf1346869.pdf
    • http://yurspace.com/uploads/1/3/0/5/130550881/teruf_rububovuf_vebidupif_tuvonisoze.pdf
    • http://allthingsyogi.net/uploads/1/3/1/3/131379211/terms.html
    • http://allthingsyogi.net/uploads/1/3/1/3/131379211/dmca.html
    • http://allthingsyogi.net/uploads/1/3/1/3/131379211/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://disejaj.files.wordpress.com/2020/06/zazojelosikexunuja.pdf
    • https://zisiwemebix.files.wordpress.com/2020/05/45465661239.pdf
    • https://raxoxatubu.files.wordpress.com/2020/05/niniruzododasowa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066fd.bin
67840f65960011ceee44b1708d214358bbf1dccb4fc2e116c7721da3efa743b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 12604 bytes

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