Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d456634027cf52…

MALICIOUS

PDF

30.4 KB Created: 2018-06-11 09:39:38 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 68cbd7beeeb54527fc939640ece1ab82 SHA-1: 3b10241c3f722ad15703b819d88aba242457bba1 SHA-256: a3d456634027cf52d3bf82a2fc41f240479e0df7c0ed96c357ffeeb847ed8ae6
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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=sweden-schools-list.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sweden-schools-list.pdfIn PDF document text
    • http://www.eduniversal-ranking.com/business-school-university-ranking-in-sweden.htmlIn PDF document text
    • http://www.dubaifaqs.com/schools-list-uae.phpIn PDF document text
    • http://www.atanet.org/certification/eligibility_approved.phpIn PDF document text
    • http://www.luth.org/resources/schools.htmlIn PDF document text
    • http://movingtosouthernsweden.com/In PDF document text
    • http://protectingeducation.org/guidelines/supportIn PDF document text
    • http://riverside-resort.net/1/the-kingdom-of-macbrayne.pdfIn PDF document text
    • http://riverside-resort.net/1/toro-mowers-service-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-booke-of-the-pylgremage-of-the-sowle.pdfIn PDF document text
    • http://riverside-resort.net/1/statics-chapter-5-solutions.pdfIn PDF document text
    • http://riverside-resort.net/1/the-power-to-get-in-a-step-by-step-system-to-get-in-anyones-do.pdfIn PDF document text
    • http://riverside-resort.net/1/the-marines-e-mail-order-bride-heroes-of-chance-creek-3-cora-seton.pdfIn PDF document text
    • http://riverside-resort.net/1/talent-equality-and-meritocracy.pdfIn PDF document text
    • http://riverside-resort.net/1/sex-marks-the-spot-69-racy-risky-amazing-places-for-intimate-adventure.pdfIn PDF document text
    • http://riverside-resort.net/1/solutions-manual-wooldridge.pdfIn PDF document text
    • http://riverside-resort.net/1/the-crucible-final-test-answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Education_in_SwedenIn PDF document text
    • https://en.wikipedia.org/wiki/SwedenIn PDF document text
    • http://www.dailymail.co.uk/news/article-5495915/Sweden-vows-ban-religious-schools-tackle-segregation.htmlIn PDF document text
    • https://www.gatestoneinstitute.org/5195/sweden-rapeIn PDF document text
    • http://www.maine.gov/doe/schools/sau.htmlIn PDF document text
    • https://www.aacsb.edu/accreditation/accredited-members/global-listing?F_Country=United+StatesIn PDF document text
    • http://abcnews.go.com/InternationalIn 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_off00003c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C43 11044 bytes
SHA-256: 9e694ab8a9627fe045a47e8006c7cb4723a5d31b3d17c04924a5988ee682037d
font_01_sfnt_off00005f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0E 6352 bytes
SHA-256: e8c6a5d8b6d8e9ab52f30f20b71b6ee174439ed822c3691fda5f1d90f858364f