Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c51d5769463f66…

MALICIOUS

PDF

29.1 KB Created: 2018-06-11 09:39:17 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 2a091d9b96a26e0b190c62b5e9f57779 SHA-1: 098339aab72d87550391cb32aa27ce68cbfc921a SHA-256: 98c51d5769463f66fd150aa7143b52030b517a23fbb35659147cfb829622a39d
130 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains embedded URLs pointing to suspicious domains, specifically 'uncpbisdegree.com', which are likely used to host or deliver malicious content. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9110

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-ancient-art-of-color-therapy-updated-including-gem-therapy-auras-and-amulets.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-ancient-art-of-color-therapy-updated-including-gem-therapy-auras-and-amulets.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-honda-civic-5-door.pdfIn PDF document text
    • http://riverside-resort.net/1/volvo-s40-2000-user-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/we-need-to-talk-living-with-the-afterlife.pdfIn PDF document text
    • http://riverside-resort.net/1/yours-truly-ebook-kirsty-greenwood.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-commonwealth-and-the-nations-studies-in-british-commonwealth-relations.pdfIn PDF document text
    • http://riverside-resort.net/1/velamma-comic-book.pdfIn PDF document text
    • http://uncpbisdegree.com/1/selection-test-answers-hearts-and-hands.pdfIn PDF document text
    • http://riverside-resort.net/1/vocab-level-e-unit-14-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-ericsson-hbh-610-headsets-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-the-strongest-metal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.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=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_off000037d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37D1 10232 bytes
SHA-256: 282de1dc22be5f9f7d12c33fd7147a60b1dff9f8b34e8d9a49fc97109cafb02e
font_01_sfnt_off00005832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5832 7172 bytes
SHA-256: fa5a2c65d0ab5e4403babe1934cfed1af93b51b84514646bdc779d57d680bcd3

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