Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5f98be4edecf38…

MALICIOUS

PDF

32.0 KB Created: 2018-06-11 09:17:35 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: c3a35f3053330045b6ce43a5c6e33490 SHA-1: 168ab34b82db7491f94f204abf36d8a0b87b2a1a SHA-256: 4b5f98be4edecf3892ca286609323b781c8aeff76acc1aad0bf146db88ac5055
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by an ML classifier as malicious. It contains embedded URLs pointing to a suspicious domain, uncpbisdegree.com, which are likely intended to trick the user into downloading a secondary payload. The document body also contains a call-to-action phrase, further supporting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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=trailblazer-air-conditioning-diagram-2003.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=trailblazer-air-conditioning-diagram-2003.pdfIn PDF document text
    • http://www.autogenius.info/gmc-envoy-mk2-second-generation-2003-fuse-box-diagram/In PDF document text
    • http://www.autogenius.info/pontiac-vibe-2003-fuse-box-diagram/In PDF document text
    • http://www.modifiedlife.com/request-a-chevrolet-car-radio-stereo-wiring-diagram/In PDF document text
    • https://www.themanualstore.com/Harley-Davidson-Sportster-Manual-p/m4295.htmIn PDF document text
    • https://www.autoanything.com/lights/anzo-usa-headlightsIn PDF document text
    • https://www.themanualstore.com/Kawasaki-Vulcan-Manual-p/m3543.htmIn PDF document text
    • https://www.greatautohelp.com/sensor-location/3800-page-2-comments.htmlIn PDF document text
    • http://www.bibme.org/In PDF document text
    • https://www.justfacts.com/globalwarming.aspIn PDF document text
    • http://new-hampshire.press/Strafford_County-New_Hampshire/Strafford_County-New_Hampshire_ho.phpIn PDF document text
    • http://uncpbisdegree.com/1/solve-riddles-answer.pdfIn PDF document text
    • http://uncpbisdegree.com/1/ssr-up6-40-125-air-compressor-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sprinter-tail-light-wiring.pdfIn PDF document text
    • http://riverside-resort.net/1/war-and-a-child.pdfIn PDF document text
    • http://riverside-resort.net/1/when-men-batter-women.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-1996-seadoo-challenger.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-auditing-arens-15.pdfIn PDF document text
    • http://riverside-resort.net/1/vw-caddy-repair-manual-torrent.pdfIn PDF document text
    • http://uncpbisdegree.com/1/studies-on-establishment-techniques-of-stylo-in-horti-pastoral-system.pdfIn PDF document text
    • http://riverside-resort.net/1/user-guide-redmi-note-4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.automotiveforums.com/t704896-discuss2003_trailblazer__a_c_air_conditioning_intermittent.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F11 11088 bytes
SHA-256: 962320716a759a11a9dd7e7acb52454b14734493e2f11902b0e2141992ac9af3
font_01_sfnt_off000061fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 7564 bytes
SHA-256: 6d0c668d7794f9676d20acfbb9a20bd790430213baf9498e7bbd4385b6fa9529

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