Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ea843da11990e9…

MALICIOUS

PDF

29.1 KB Created: 2018-06-11 09:38:03 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 0826005bcc08805c369594e4bc4d3600 SHA-1: c8f0406d54e7d6975da05b1a920d4c19df320292 SHA-256: 52ea843da11990e98fbefa0a09eba3267f00a7cb403a215734a246d76dd95903
130 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a heuristic firing for ML_NYX_PDF_MALICIOUS indicates a high likelihood of malicious content. The document body suggests a lure related to an exam timetable, and the presence of a download button heuristic further supports a social engineering attack. The primary malicious URL identified is http://uncpbisdegree.com/download3.php?q=the-timetable-for-joint-exam-4-ss2-2018.pdf, which is likely used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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-timetable-for-joint-exam-4-ss2-2018.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-timetable-for-joint-exam-4-ss2-2018.pdfIn PDF document text
    • http://www.centropreservacionpapel.com/colorful/colorful_fantasy_coloring_book_by_molly_harrison.pdfIn PDF document text
    • http://burnscamp.org.uk/2/4/el-gran-misterio-de-bow.pdfIn PDF document text
    • http://hamburggermany.men/Hamburg-Germany/Hamburg-Germany_bb.phpIn PDF document text
    • http://riverside-resort.net/1/waec-animal-husbandry-answer-tomorrow.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-beatrice-letters-a-series-of-unfortunate-events.pdfIn PDF document text
    • http://riverside-resort.net/1/vbs-answers-in-genesis-2017.pdfIn PDF document text
    • http://riverside-resort.net/1/user-manual-redmi-1s.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stewart-calculus-6e-solutions-manual-free.pdfIn PDF document text
    • http://uncpbisdegree.com/1/techniques-incident-handling-information-assurance.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-art-of-conversation-change-your-life-with-confident-communication.pdfIn PDF document text
    • http://riverside-resort.net/1/visiting-card-background-design-cdr-free-download.pdfIn PDF document text
    • http://riverside-resort.net/1/vtu-10ecl67-lab-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/tally-objective-questions-and-answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.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_off000034a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A3 10524 bytes
SHA-256: ed8a88fbc2d1f05935e21a06fb19107b6bf80d2f45a0a5efd479ae0c93c0b5cc
font_01_sfnt_off000055ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FF 7968 bytes
SHA-256: c515d1ead590bd0a97c3d3bfa8f8578914867ec7079337ba379812331f731a97

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