Malicious PDF — malware analysis report

Static analysis result for SHA-256 de255e444036ff97…

MALICIOUS

PDF

35.8 KB Created: 2020-04-04 13:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5d51bfc2a619623c72591478b13e1f8 SHA-1: 7f8d5a69ad0164b07e9c53daea4c4053a2866382 SHA-256: de255e444036ff973ca61d58074cdce10634b770cdcf945dee4e0a338150dc84
94 Risk Score

Malware Insights

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

The PDF_SEO_LINK_FARM heuristic indicates this document contains a large number of external links, a common tactic for SEO manipulation or distributing malicious payloads. The ML classifier strongly supports a malicious verdict. The embedded URLs point to various domains, suggesting a link farm or redirection infrastructure. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://hinterlandtreeservicesbyronbay.com/uploads/1/3/1/4/131453734/131453734.html#auto-vox+wifi+dash+cam+d6+pro+manual
    • http://cleancarpetspeoria.com/uploads/1/3/1/4/131454537/7969524.pdf
    • http://peacockchildcare.com/uploads/1/3/0/8/130814407/9131107.pdf
    • http://wanderlustcamperhire.com/uploads/1/3/0/6/130621900/naripunidiremuruses.pdf
    • http://marketingprivateschools.com/uploads/1/3/0/3/130379291/1713056.pdf
    • http://oldestylevape.com/uploads/1/3/0/5/130588906/221f6bd9b.pdf
    • http://matthewquinlanphotography.com/uploads/1/3/0/5/130551198/c5345903eb.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_off00005f4b.bin
373c645b5dfd1830569b401cc96f010a4e9bca9308bdad84be92978d5f3ccb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4B 9312 bytes

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