Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97d95e1680080af…

MALICIOUS

PDF

28.5 KB Created: 2018-06-11 09:20:25 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 42b006a7bf0c686ae9aa428571d7cd48 SHA-1: d95f0e7fae39c379429d3be1b381f4c5cb3c12cc SHA-256: a97d95e1680080af2c92c441dce760621181e2197a12fe2920788036187c71fe
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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=the-fragrant-mind-aromatherapy-for-personality-mood-and-emotion-valerie-ann-worwood.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-fragrant-mind-aromatherapy-for-personality-mood-and-emotion-valerie-ann-worwood.pdfIn PDF document text
    • http://oetq.net/E86EIGaIn PDF document text
    • http://uncpbisdegree.com/1/similes-for-bullies.pdfIn PDF document text
    • http://riverside-resort.net/1/why-is-inheritance-tax-so-high.pdfIn PDF document text
    • http://uncpbisdegree.com/1/six-flags-academic-adventures-packet-answers-2015.pdfIn PDF document text
    • http://riverside-resort.net/1/wedding-card-design-models.pdfIn PDF document text
    • http://riverside-resort.net/1/what-are-disks-when-dividing-decimals.pdfIn PDF document text
    • http://riverside-resort.net/1/user-manual-toshiba-satellite-s70-b-laptop.pdfIn PDF document text
    • http://uncpbisdegree.com/1/structural-drawing-for-dog-legged-stair.pdfIn PDF document text
    • http://uncpbisdegree.com/1/strategies-and-literary-elements-grade-9-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/unethical-companies.pdfIn PDF document text
    • http://uncpbisdegree.com/1/skeletal-system-packet-answers-biology.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=DE_EN&a=http%3a%2f%2foetq.net%2fE86EIGaIn 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_off000035aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35AA 10264 bytes
SHA-256: 15a356cd915d6c4ab902b996a82523357abf47f9ded993044e03a53d21957e84
font_01_sfnt_off0000564d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x564D 7072 bytes
SHA-256: bcc6af74f4ad6d835eca6b47e05147e2e00b41dc86ec970e797f28d650446272