Malicious PDF — malware analysis report

Static analysis result for SHA-256 a787799b7cb136e6…

MALICIOUS

PDF

83.1 KB Created: 2020-12-26 17:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1ae58bd08eea486090a840685a98377d SHA-1: 1d62658822a6e8f0fa6704028eb4036976d8fed8 SHA-256: a787799b7cb136e69e80bd1971eda1780c2dbb2fb084d928443ed76faa380db2
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains heuristics indicating it is a phishing lure, specifically impersonating Apple to trick users into clicking a malicious link. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic 'SE_BROWSER_INSTALL_LURE' point towards a social engineering attack aimed at credential theft or malware installation.

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/3978568.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffine.ru/strik?utm_term=business+card+reader+app+for+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470218/normal_5fb363b3600e5.pdfIn PDF document text
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/3978568.pdfIn PDF document text
    • https://cdn.sqhk.co/lodesejidi/cgc2Vhi/sudejudomeluw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fc509f9db6f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nogedapuvul/igiig9I/9th_class_computer_science_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fd7ab8f98043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f966472bb33f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fbe8b278e44b.pdfIn PDF document text
    • https://pudevadiketimim.weebly.com/uploads/1/3/4/6/134606785/d56a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rirusozo/45159099941.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/zowowodafej.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/60978474905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1416b388-838f-443f-bc06-8f45ecc84a76/25605995395.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/59487062768.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/greek_god_wind_north.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_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 5260 bytes
SHA-256: fac28586f167824cd4209b05c51c295fbd2428fdbea154d5a7888f01c06d3073
font_01_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 10804 bytes
SHA-256: 790a122c927ae9197444e450c157d822df1dac15cf708988b84bdc1a05fafad2

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