Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51fc7267db6c3c7…

MALICIOUS

PDF

76.6 KB Created: 2021-04-24 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4f95e0f500e13aafbefb1a675b2a28ed SHA-1: ca299622b457149f2cf4e3295fb09dc32d4cea9f SHA-256: e51fc7267db6c3c79d0fb566c16de83fdd5ac996088483c4fdde83bb3c2773e0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The primary malicious URL, https://vilenefex.ru/strik, is presented as a search result, aiming to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=what+are+place+of+service+codes PDF link annotation
    • https://cdn.sqhk.co/lokovipazal/UjeebQv/ball_shooter_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/jbmijif/offending_behaviour_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_600215850cd6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5fcaf810907b6.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/b7Dm54T/tower_conquest_mod_apk_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fdee41ae7211.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/jaggA5A/16920218575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4078cf6-8fa3-420b-ab61-258487076e43.filesusr.com/ugd/a3907e_97bd4d5dbd6147138f1498e5d9945866.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/freelance_fashion_designer_contract_template.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_683e1d892bbb401e8446b5daf9c46b2d.pdf?index=trueIn PDF document text
    • http://sulanulug.epizy.com/algebra_2_chapter_10_assessment_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/is_primerica_a_scheme.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/duel_of_the_fates_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/critical_theory_today_3rd_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/14690339266.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/nakozajovebapuwuletiwom.pdfIn PDF document text
    • http://jupuluna.epizy.com/jeniwoxiju.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/laxefewujanovimegukunuxes.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_3aeb6aaa68b3430abd762043a07f4826.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/lotajamexadupedikakiwox.pdfIn PDF document text
    • http://dirodinuvuz.rf.gd/ibps_result_po_2020_download.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_6ca024972d594bb6a79ce453b90ee6d6.pdf?index=trueIn 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_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 5316 bytes
SHA-256: 8f22d97df87ea44cdbc38704c75f35592f0be43cbe2c7a7d3f576e118daa62c6
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 10912 bytes
SHA-256: dd3065c4703bd8833f9269655360182567bd65e6b14a37af6ffabafd3e5fa9d9

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