Malicious PDF — malware analysis report

Static analysis result for SHA-256 293197e8d0a8fbca…

MALICIOUS

PDF

29.2 KB Created: 2018-06-11 08:27:23 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 4daf8cd2e9d15b8ac9bedf4de2437757 SHA-1: 91df75f8aceb02ffc8570b38a059228945b07715 SHA-256: 293197e8d0a8fbca6522baaf84ca8769c974233612a2060f9fd6ebb30bd0b860
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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=surgical-techniques-in-anterior-and-posterior-lamellar-corneal-surgery-1st-edition.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=surgical-techniques-in-anterior-and-posterior-lamellar-corneal-surgery-1st-edition.pdfIn PDF document text
    • http://www.jaypeebrothers.com/Browseallbook.aspx?searchby=TitleIn PDF document text
    • http://uncpbisdegree.com/1/stories-with-r-controlled-words.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-catholic-church-the-jews-in-argentina-1933-1945.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-harry-harrison-megapack-11-classics-of-science-fiction.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-structural-stability-hodges.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-giver-short-answer-questions.pdfIn PDF document text
    • http://riverside-resort.net/1/university-of-limpopo-prospectus-turfloop-campus-2018.pdfIn PDF document text
    • http://riverside-resort.net/1/yahoo-ask-questions-get-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-rm250-manual-1995.pdfIn PDF document text
    • http://uncpbisdegree.com/1/telus-optik-tv-channel-guide.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-of-design-of-wood-structures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.ufrgs.br/imunovet/molecular_immunology/pathohomotissueskin.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C8 10920 bytes
SHA-256: 2059a900e8a55a7663fcee2199293a1c1e61b0b46a063550b6eeeffbf75c2b86
font_01_sfnt_off0000582c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x582C 7452 bytes
SHA-256: 2b4803e078cde6c7903f95b31c26ec7844dc3a41c2510d0564fecf1920cf8802