Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309af8ed41df986…

MALICIOUS

PDF

29.6 KB Created: 2018-06-11 08:26:03 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 74762675a93ad835112e93724cc662ca SHA-1: 1d8bfcb5f79c4f577122f0f1e7c67706812c78e6 SHA-256: 7309af8ed41df986ba2d17f3b07e1da0adb42930d38125a551d54577c4436cc4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains heuristics indicating it is a fake download lure, specifically designed for SEO poisoning. The document body and extracted URLs point to a download link hosted on 'uncpbisdirect.com', which is likely a malicious domain. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9525

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uncpbisdegree.com/download3.php?q=wiring-diagram-sportage.pdf
    • http://uncpbisdegree.com/download4.php?q=wiring-diagram-sportage.pdf
    • http://www.modifiedlife.com/request-a-kia-car-radio-stereo-wiring-diagram/
    • https://www.the12volt.com/installbay/forum_posts.asp?tid=123355
    • http://www.tehnomagazin.com/Auto-radio-car-connector/KIA-Car-Radio-Wiring-Connector.htm
    • http://www.autogenius.info/volkswagen-transporter-t5-essentials-from-september-2009-fuse-box-diagram/
    • http://www.autogenius.info/chevrolet-silverado-mk1-first-generation-1999-2007-fuse-box-diagram/
    • https://www.themanualstore.com/Boat-Manual-s/210.htm
    • https://www.themanualstore.com/Wisconsin-VH4D-Engine-Manuals-s/35825.htm
    • http://uncpbisdegree.com/1/the-cold-room-taylor-jackson-4-jt-ellison.pdf
    • http://uncpbisdegree.com/1/the-closers-harry-bosch-11-michael-connelly.pdf
    • http://riverside-resort.net/1/vorrang-der-abfallverwertung-eine-analyse-des-bundesabfallgesetzes.pdf
    • http://uncpbisdegree.com/1/sony-dvp-k86p-portable-dvd-players-owners-manual.pdf
    • http://riverside-resort.net/1/wedding-card-design-in-singapore.pdf
    • http://uncpbisdegree.com/1/sumario-de-la-natural-historia-de-las-indias.pdf
    • http://uncpbisdegree.com/1/spring-in-the-air-coupon.pdf
    • http://riverside-resort.net/1/user-guide-for-uniden-phone.pdf
    • http://uncpbisdegree.com/1/service-light-on-chevy-cavalier-2002.pdf
    • http://riverside-resort.net/1/walther-ppk-s-bb-gun-owners-manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://en.wikipedia.org/wiki/2015
    • http://go.microsoft.com/fwlink/?LinkID=617350
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409
    • https://go.microsoft.com/fwlink/?linkid=868922
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409
    • http://go.microsoft.com/fwlink/?LinkID=617297
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000039f4.bin
39358023619cf3d2c9be1b18b1dba4a6e13fbfbd52b4e28aabee60bbb5630ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x39F4 10172 bytes
font_01_sfnt_off00005a5e.bin
ffcb8e439f0a18bad8009f301b3656a8a33b35cd7ec731c7c8754ec98565aa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 6980 bytes

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