Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8851468048c02c0…

MALICIOUS

PDF

33.0 KB Created: 2018-06-11 08:48:42 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 2f364dc0414da2dc6c2cd71b755cc7d9 SHA-1: 015122c5d8e10a7fd2471d80be4ec0f18dd72b99 SHA-256: c8851468048c02c0bc4f97196285954662edb087632aa85f0e880dcdd5b3dc46
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded URLs that point to a domain associated with malicious downloads. The document body, though partially corrupted, suggests a lure for a service manual, which is a common tactic for social engineering. The ML classifier also flagged this PDF as malicious, increasing confidence in its suspicious nature. No scripts were extracted, limiting the ability to determine the exact payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8818

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=sevice-manuel-for-suzuki-140.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sevice-manuel-for-suzuki-140.pdfIn PDF document text
    • http://www.fiches-auto.fr/essai-renault/motorisations-212-moteurs-consommation-renault-megane-3.phpIn PDF document text
    • http://www.fiches-auto.fr/consommation/In PDF document text
    • http://www.fiches-auto.fr/consommation-renault/In PDF document text
    • http://www.fiches-auto.fr/avis-honda/avis-231-honda-accord.phpIn PDF document text
    • http://www.fiches-auto.fr/avis/In PDF document text
    • http://www.fiches-auto.fr/avis-honda/In PDF document text
    • http://www.wjking.co.uk/vauxhall/customer-reviewsIn PDF document text
    • https://www.elite-auto.fr/temoignages/In PDF document text
    • https://www.transistornet.de/In PDF document text
    • http://www.lemonlaw.com/wordpress/stabilitrak-problems/In PDF document text
    • http://www.lemonlaw.com/wordpress/In PDF document text
    • http://www.lemonlaw.com/wordpress/general-motors/In PDF document text
    • http://uncpbisdegree.com/1/the-herefordshire-school-of-romanesque-sculpture.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-impact-of-the-19th-amendment.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-home-phones-answering-machines.pdfIn PDF document text
    • http://uncpbisdegree.com/1/song-of-the-rain-ncert-solutions.pdfIn PDF document text
    • http://riverside-resort.net/1/worked-solutions-to-student-book-questions-chapter-14-from.pdfIn PDF document text
    • http://riverside-resort.net/1/university-of-toronto-undergraduate-tuition.pdfIn PDF document text
    • http://riverside-resort.net/1/value-respect-and-attachment.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-diego-masciaga-way-lessons-from-the-master-of-customer-service.pdfIn PDF document text
    • http://uncpbisdegree.com/1/testosterone-information.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-a-cappella-singer-who-lost-her-voice-other-stories-natural-medicine.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=FR_EN&a=http%3a%2f%2fwww.fiches-auto.fr%2fessai-renault%2fmotorisations-212-moteurs-consommation-renault-megane-3.phpIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=FR_EN&a=http%3a%2f%2fwww.fiches-auto.fr%2favis-honda%2favis-231-honda-accord.phpIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=FR_EN&a=https%3a%2f%2fwww.elite-auto.fr%2ftemoignages%2fIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=DE_EN&a=https%3a%2f%2fwww.transistornet.de%2fIn 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_off00004544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4544 10312 bytes
SHA-256: bcb6946aa1adf193b5c62c739a7f3594578ba9067179e5212f0ba4b4f5c75782
font_01_sfnt_off000065fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FC 7256 bytes
SHA-256: b081304fd8942bebd59e3919e4fef208911c082a945ab55bf53316d0602af9fd