Malicious PDF — malware analysis report

Static analysis result for SHA-256 512d39ebc1962631…

MALICIOUS

PDF

47.6 KB Created: 2020-05-30 17:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd753603db265aa7f3465007f18295b1 SHA-1: 107b1bb6757cdce75afea1975ffcad56b5baaffa SHA-256: 512d39ebc1962631768073c52afc0bd20cc201caf0852326dd7a74c46bd7d956
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to 'Liderazgo en las organizaciones libro' and mentions 'wkhtmltopdf', suggesting a lure to a website disguised as a book. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to external sites, likely for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 3

  • 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
  • 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://douniuniuwanfa.br3h.com/uploads/1/3/0/4/130490687/130490687.html#liderazgo+en+las+organizaciones+libro
    • http://mswinberg.com/uploads/1/3/1/8/131856096/6790987.pdf
    • http://kjmarketingconcepts.com/uploads/1/3/1/3/131398540/6383439.pdf
    • http://slflooringltd.net/uploads/1/3/0/5/130590678/mexasijilisab_befunasuxe.pdf
    • http://bronzedbyheather.com/uploads/1/3/1/6/131637881/d33d3030.pdf
    • http://bentleyassetmanagement.com/uploads/1/3/0/2/130270775/af419a38cb.pdf
    • http://crownpairings.com/uploads/1/3/0/6/130639960/pafitug-vibodibafule-dikaw-siwozusetuge.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_off00008a25.bin
6dcf5585beef551ed6c42acaaca2292280f3d6110a39a05242a5d076e223de5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A25 12144 bytes

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