Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c75f35e416b3c21…

MALICIOUS

PDF

45.2 KB Created: 2020-04-21 00:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8f3f0f2cba30e9cf254637584e8c8ac8 SHA-1: 9ed823c9ca4fa4b426afe91807e55d541b20b058 SHA-256: 6c75f35e416b3c215ec5fa04d2b79aed4a8269e60f6741d421752f9d329a06b8
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and extensive URL usage indicate a likely attempt to redirect users to potentially harmful content or phishing sites.

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://tcsonline.net/uploads/1/3/0/5/130545475/130545475.html#sample+audit+report+excel+format
    • http://atlasbuy.net/uploads/1/3/1/4/131437948/lodibujufuzajafafude.pdf
    • http://ministrycoordinator.net/uploads/1/3/1/3/131397930/xuwakesijud-nisumoxipavogo-fasapexo-zagifidogumum.pdf
    • http://villaforsaleandalucia.com/uploads/1/3/1/3/131384166/bojuv_xejolajunala_bapig.pdf
    • http://liquidbluesrq.com/uploads/1/3/0/5/130543538/3703023.pdf
    • http://outcomedisabilityservices.com/uploads/1/3/0/8/130873984/tufanepalezinud.pdf
    • http://donkahmedie.store/uploads/1/3/1/4/131483027/gibip.pdf
    • http://nannyshareperth.com/uploads/1/3/1/3/131379552/1435295.pdf
    • http://wisecountyhumanesociety.net/uploads/1/3/0/6/130604500/ginexox.pdf
    • http://ducksnestdecoys.com/uploads/1/3/1/4/131483491/rafuvaluna.pdf
    • http://mystudytutor.com/uploads/1/3/1/3/131384175/6a680e01cb41ff.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_off000087df.bin
37e6a0a4d9a311a40d0a8fb820d98893a1f6ef263c06d9ed31e9c1b272931b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DF 8536 bytes

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