Malicious PDF — malware analysis report

Static analysis result for SHA-256 c511b3a794e0f88d…

MALICIOUS

PDF

31.2 KB Created: 2018-06-11 10:02:06 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 692d398e8af4e912ecba8892845f1f7c SHA-1: 03350ac5bf687d2777ec4c691eb7febce22b0f5c SHA-256: c511b3a794e0f88db89540cfae93b8e59e90c42fbe40c655cac737018051b682
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9515

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=vax-rapide-spring-clean-instruction-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=vax-rapide-spring-clean-instruction-manual.pdfIn PDF document text
    • http://hamburggermany.men/Hamburg-Germany/Hamburg-Germany_bq.phpIn PDF document text
    • http://www.wolfbane.com/tv.htmIn PDF document text
    • http://www.ideadiez.com/In PDF document text
    • http://riverside-resort.net/1/title-solving-equations-a-kinesthetically-engaging-approach.pdfIn PDF document text
    • http://riverside-resort.net/1/sweden-university-cost.pdfIn PDF document text
    • http://riverside-resort.net/1/service-manual-for-toyota-vigo.pdfIn PDF document text
    • http://riverside-resort.net/1/the-upheaval-survivor-chronicles-1-erica-stevens.pdfIn PDF document text
    • http://riverside-resort.net/1/the-faery-teachings.pdfIn PDF document text
    • http://riverside-resort.net/1/the-worlds-toughest-endurance-challenges.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-trouble-code-71.pdfIn PDF document text
    • http://riverside-resort.net/1/traffic-lights-wiring-diagram-in-plc.pdfIn PDF document text
    • http://riverside-resort.net/1/soft-reset-samsung-omnia-2.pdfIn PDF document text
    • http://riverside-resort.net/1/the-official-history-of-the-aaa-the-story-of-the-worlds-oldest-athletic-association.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.manualslib.com/products/Vax-V-135u-Rapide-Spring-Clean-3827116.htmlIn PDF document text
    • https://www.manualslib.com/brand/In PDF document text
    • https://www.manualslib.com/brand/vax/In PDF document text
    • https://www.manualslib.com/brand/vax/vacuum-cleaner.htmlIn PDF document text
    • https://www.manualslib.com/manual/539059/Vax-V-021.htmlIn PDF document text
    • https://www.amazon.co.uk/Rug-Doctor-Deep-Carpet-Cleaner/dp/B016U5N654In PDF document text
    • https://www.amazon.co.uk/Vacuum-Floor-Cleaners/b?ie=UTF8&node=3147711In PDF document text
    • https://www.amazon.co.uk/carpet-washers/b?ie=UTF8&node=3147751In PDF document text
    • https://mail.google.com/mail/u/0/In 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FD1 10024 bytes
SHA-256: dd3ea6e02fc23142b3fed1dd35a6c5c059d4d35a3612b0e2c9c77850e03c3156
font_01_sfnt_off00005fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC0 7152 bytes
SHA-256: 13e92f1b3f6a04503ff14c32712903ab11af131da839c5c2b19776c39529e0ba

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