Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4b5083f3511701…

MALICIOUS

PDF

34.2 KB Created: 2020-06-14 11:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 991d6141d14c833e4812d90e330dd60b SHA-1: 2c2ce23425304bf21f13b143254eba7b0a089186 SHA-256: df4b5083f3511701e289d880268ea166ce331cc45ca641b8d7af007d293d2a7c
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 are structured as SEO-optimized PDF URLs. The document body text, though partially corrupted, includes references to 'asvab math study guides' and the wkhtmltopdf application, suggesting a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://williamscontracting.org/uploads/1/3/1/0/131070170/131070170.html#asvab+math+study+guides
    • http://revitrenderings.com/uploads/1/3/0/6/130620917/xorosanekadu-sokixelopatalof.pdf
    • http://passionatelymel.com/uploads/1/3/0/7/130740180/piwudosazisiz.pdf
    • http://w6lo6.bpmtc.com/uploads/1/3/1/3/131379729/bopevekifelu.pdf
    • http://tcinh.com/uploads/1/3/0/6/130620469/rakozowosexox.pdf
    • http://pinkelephantspa.com/uploads/1/3/0/7/130775644/gutute-sojabudevume-wizexineg.pdf
    • http://cpanel.phimi.pt/uploads/1/3/1/8/131856331/1654519.pdf
    • http://3amdesignsbyac.com/uploads/1/3/0/4/130435611/joxobut.pdf
    • http://4keepsake.net/uploads/1/3/0/5/130589345/9846555.pdf
    • http://host110.carmichaelnl.com/uploads/1/3/1/8/131856492/20b211c.pdf
    • http://mx.rise.lifecenterofbrandon.org/uploads/1/3/0/5/130551089/8688966.pdf
    • http://thisoklahome.com/uploads/1/3/0/4/130491599/495807.pdf
    • http://podollansa.devsite-1.com/uploads/1/3/0/3/130379070/2051934.pdf
    • https://famunuguraj492377956.files.wordpress.com/2020/06/suzujirafufefibav.pdf
    • https://fogojifoxuni.files.wordpress.com/2020/06/33665167509.pdf
    • https://bomutap.files.wordpress.com/2020/06/47990230062.pdf
    • https://kufexetironi.files.wordpress.com/2020/06/peped.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_off00005a92.bin
3f6104cee88c1180a2d39871c2038af828b7e0ebf89bd53360eb9ef277552797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A92 10288 bytes

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