Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85e9ccdd38306c2…

MALICIOUS

PDF

40.1 KB Created: 2020-04-05 08:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab6ed6d1914dbd3b189084b1c0f894ee SHA-1: 477b77c563a418601c45a40b27d205ac1364607d SHA-256: a85e9ccdd38306c266cb8eedf7787e1057a200d21a283287f93f197e70effe99
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to distribute malicious content. The document body, though partially corrupted, contains text related to 'Goodman split air conditioner troubleshooting' and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://riverbendstorage.net/uploads/1/3/0/8/130813378/130813378.html#goodman+split+air+conditioner+troubleshooting
    • http://aaic.eu/uploads/1/3/1/3/131380908/wivugutad_numutakiw.pdf
    • http://portfolioinvestmentpty.org/uploads/1/3/0/6/130622103/lelajomufe-bupejivizevoke.pdf
    • http://bentworthcommunitycenter.com/uploads/1/3/0/7/130775797/e8f13ff34e3e.pdf
    • http://florablackettdesigns.com/uploads/1/3/0/4/130483928/f856a.pdf
    • http://mobilegroomersarasota.com/uploads/1/3/0/3/130323260/596e969d.pdf
    • http://zh-hyland.com/uploads/1/3/1/3/131384573/tebagu.pdf
    • http://waterfordcanalfest.com/uploads/1/3/0/5/130542831/cd86af58901.pdf
    • http://guildfordhipandknee.org/uploads/1/3/0/8/130873787/bodasadone-jejogala-kidofurezosu-janawefelazirop.pdf
    • http://nastockdogassociation.com/uploads/1/3/0/5/130550763/3800318.pdf
    • http://southamericarealstate.com/uploads/1/3/0/5/130590059/3888487.pdf
    • http://brazoscarbide.com/uploads/1/3/0/6/130621164/03448bde0b941.pdf
    • http://autodiscover.theafzelius.com/uploads/1/3/1/4/131453252/9099247.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_off0000763a.bin
e31e956e34f9b41d7cf4b7eb925c9bb111c75fd0e4d4d2d70333762b7c75b2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763A 7340 bytes

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