Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2a4770d0ced2e9…

MALICIOUS

PDF

33.4 KB Created: 2020-05-16 13:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1472bfbb835fc7ede91676b0955b4ced SHA-1: f4488063ddab30a59bccd5a9833082d97269321f SHA-256: 6d2a4770d0ced2e90164e9824380dda3d4d26e9c3c698da72645683b3615eda7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This suggests a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The document body text, though corrupted, contains a reference to 'franchise tax reports due texas', which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://capefearknowledgeshare.com/uploads/1/3/1/4/131438557/131438557.html#franchise+tax+reports+due+texas
    • http://gillianreynolds.com/uploads/1/3/1/4/131409200/5488061a95089.pdf
    • http://spoilism.com/uploads/1/3/0/6/130639875/5702d3ab48d6b9.pdf
    • http://segwayaspen.com/uploads/1/3/0/5/130546415/6864939.pdf
    • http://sparepartfinders.com/uploads/1/3/1/8/131856244/2f28826.pdf
    • http://preferredproviders.net/uploads/1/3/1/3/131398185/2093861.pdf
    • http://onekoh.com/uploads/1/3/0/8/130814076/fenamad-fakamagu.pdf
    • http://kalilabdullah.com/uploads/1/3/0/4/130483244/fugonenimov.pdf
    • http://pickawaycountyhelpmegrow.com/uploads/1/3/1/0/131070458/6218b7d6caeaa9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000057e8.bin
372775a9025f66fd5650b1413bab30af30337638efa749b87fa9c272121e9605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E8 10264 bytes

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