Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5826a85d1c64c46…

MALICIOUS

PDF

29.9 KB Created: 2018-06-11 08:07:37 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a156079841059595b6547feafc5f5381 SHA-1: b27d31dde9a7f5cbab1e2e3b95d1df0f91be54f4 SHA-256: f5826a85d1c64c465ccbf457aa982f81734e13c53a1c5a697383366a39627ff0
130 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier. It contains embedded URLs pointing to download locations, specifically mimicking a user manual for a Sharp cash register. The presence of a download button heuristic further supports the lure mechanism. The primary attack vector appears to be social engineering, tricking the user into downloading a potentially harmful file from the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9240

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=sharp-cash-register-xe-a21s-user-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sharp-cash-register-xe-a21s-user-manual.pdfIn PDF document text
    • http://www.sharp-register.com/portals/0/manuals/XEA21S_English_Spanish.pdfIn PDF document text
    • http://getmanual.com/In PDF document text
    • http://uncpbisdegree.com/1/sunday-school-lessons-for-2014.pdfIn PDF document text
    • http://uncpbisdegree.com/1/slot-car-track-design-software-download.pdfIn PDF document text
    • http://riverside-resort.net/1/walmart-customer-service-desk-hours.pdfIn PDF document text
    • http://riverside-resort.net/1/what-happens-in-january.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-for-mustang-930a.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-for-john-e-freund-mathematical-statistics.pdfIn PDF document text
    • http://riverside-resort.net/1/what-are-destroyers-named-after.pdfIn PDF document text
    • http://riverside-resort.net/1/yishvara-2000-the-hindu-ancestor-of-judaism-speaks-to-this-millennium.pdfIn PDF document text
    • http://riverside-resort.net/1/zumdahl-introductory-chemistry-6th-edition-answer-key.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-big-buck-adventure-turtleback-school-library-binding.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/manual/1081698/Sharp-Xe-A21s.htmlIn PDF document text
    • https://www.manualslib.com/products/Sharp-Xea21s-Thermal-Fax-Machine-113325.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_off000038a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38A0 10800 bytes
SHA-256: 052a3472ca51b49918e17a02de42ae77347f13f370a8ba32585572abaabcb7a8
font_01_sfnt_off00005ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB8 7376 bytes
SHA-256: 3635b4410d8c9a0d4968d3e76d770dc20faa497fd6abad22ae5627a7af4f1d3e

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