Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ea1ab81875d384…

MALICIOUS

PDF

34.2 KB Created: 2020-04-21 14:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc0eb34f2e48634e0f33dae38351b176 SHA-1: 8cb9690f36f8418f5273fcaddd83046803b845a1 SHA-256: 73ea1ab81875d384bb853065aead5a9b6611db44ec218f8ae42078a214eb403f
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO link farms, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://trentriverdesigns.com/uploads/1/3/0/5/130551257/130551257.html#free+job+resignation+letter+template
    • http://yourfavoritehorsewhisperer.com/uploads/1/3/0/2/130287488/soxazudikokan.pdf
    • http://cliccaestampaonline.store/uploads/1/3/0/5/130589168/8785200.pdf
    • http://blackdiamondcleans.com/uploads/1/3/0/3/130323571/6612384.pdf
    • http://rediscoverjoy.org/uploads/1/3/0/6/130620232/2065201.pdf
    • http://brotherstransit.com/uploads/1/3/0/7/130740462/wadixe.pdf
    • http://robsrumnroll.com/uploads/1/3/0/3/130323516/b852a0b6df61f59.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_off00005e74.bin
3353cbdf4bf74df3ba14b73814def84b04d9559e0e38bb4122631cf8c0953a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 7864 bytes

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