Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ca3de76fa7df70…

MALICIOUS

PDF

77.3 KB Created: 2021-02-13 17:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2d3381afffa2a84e1c3afe1779c534df SHA-1: 25aea26ee54f7c6fa0e53030b052ec7f5adcab55 SHA-256: a4ca3de76fa7df7078bb746a211fdf931d866bf0f7ffeb92529bb90ed9c877d6
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a payment redirection lure, attempting to trick users into clicking embedded links. The document contains numerous links, many pointing to disposable hosting, suggesting a phishing or scam operation designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://bologen.ru/wix?keyword=credit+paper+follows+paypal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381101/normal_60013a8d54294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404512/normal_60095d207f00e.pdfIn PDF document text
    • http://rubezemanugewev.22web.org/rowdy_anthem_video_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ff56ccb9947e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_600d648622001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelubameta.epizy.com/oxford_bookworms_library_starter.pdfIn PDF document text
    • http://pejefovad.epizy.com/information_security_questions_and_answers_mcq.pdfIn PDF document text
    • http://vajitefafuxuz.epizy.com/tivinenijatepijad.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/nunupenujotobabexefog.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/77768192583.pdfIn PDF document text
    • http://wulekugigewipo.epizy.com/gusubazeted.pdfIn PDF document text
    • http://gexaforagugozen.rf.gd/reason_for_leaving_previous_job_answers.pdfIn PDF document text
    • http://fikuputo.epizy.com/96088941317.pdfIn PDF document text
    • http://winuzuvejifod.epizy.com/mixawixumupuxodoge.pdfIn PDF document text
    • http://difugarulid.epizy.com/16638182447.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 5136 bytes
SHA-256: a4369bb457d3b83c8006bc41f6339432b4b3b72f0309ff54be9344e28dd08b09
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10924 bytes
SHA-256: b9672a1cdbcdf73821dcdc2b9b6a04340d943215d26a2e266b1377d638f5c18f

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