Malicious PDF — malware analysis report

Static analysis result for SHA-256 af089490f9cddb78…

MALICIOUS

PDF

29.8 KB Created: 2018-06-11 09:39:12 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 0faad67abf8b156018358563879ee8c4 SHA-1: 84c6483642525188b97dea70600d459428fcb578 SHA-256: af089490f9cddb7807491b262aaaf6373334bc156c617e75301e5ba938a93b3d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The ML classifier strongly flagged this PDF as malicious. The document body contains embedded URLs that mimic a download link for a textbook, which is a common lure. The presence of these URLs, combined with the ML detection, indicates a phishing attempt designed to trick users into downloading a malicious file. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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=textbook-and-color-atlas-of-traumatic-injuries-to-the-teeth-hardcover.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=textbook-and-color-atlas-of-traumatic-injuries-to-the-teeth-hardcover.pdfIn PDF document text
    • http://uncpbisdegree.com/1/survival-of-the-sickest-answer-key.pdfIn PDF document text
    • http://riverside-resort.net/1/volvo-penta-120s-workshop-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-chess-player-chronicle-volume-4.pdfIn PDF document text
    • http://riverside-resort.net/1/urquiza-ascendencia-vasca-y-descendencia-en-el-r-o-de-la-plata.pdfIn PDF document text
    • http://riverside-resort.net/1/wiring-a-condenser-208-230vac.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sunbeam-snr13tfpaw-refrigerators-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stoich-challenge-lab-decomposition-of-baking-soda-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/united-states-corps-of-engineers-book.pdfIn PDF document text
    • http://riverside-resort.net/1/workshop-manual-for-volvo-fh12.pdfIn PDF document text
    • http://riverside-resort.net/1/workshop-manual-suzuki-swift.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.onelook.com/pm/In PDF document text
    • http://www.loot.co.za/index/html/index4360.htmlIn PDF document text
    • http://www.loot.co.za/index/html/index4255.htmlIn PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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_off0000394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x394C 10492 bytes
SHA-256: 7e63237195c39a0807667ab82035aff9e31d00426d96b9ab20517e1a6efda78f
font_01_sfnt_off00005aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAD 7252 bytes
SHA-256: a0d76c1ec92dc2d201ca1f409c04bef4fad307b57aab4a252339226ef7fd9b22

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