Malicious PDF — malware analysis report

Static analysis result for SHA-256 806ab4829ba297b0…

MALICIOUS

PDF

76.1 KB Created: 2021-01-24 11:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a8591fe2ecf412d5ec42aa55f5c24f1a SHA-1: 8eb3eb1e3cb511c28c1e38566378eff08e9920a5 SHA-256: 806ab4829ba297b096834479263a31f855deefc94addafc0de9aec55d4ece21c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/aws?utm_term=excel+merging+data+from+multiple+worksheets PDF link annotation
    • http://deemonatrafik.xyz/puppet_pals_harry_potter_dracozbbi9.pdfIn PDF document text
    • http://idealica-italy.site/microsoft_365_admin_portal_login0ttdt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_5fe904b98a545.pdfIn PDF document text
    • http://chemistryplus.space/684330326027jjv4.pdfIn PDF document text
    • http://grantmedica.ru/kitty_kate_cooking_restaurantsar7ge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_5fe86282bc88f.pdfIn PDF document text
    • http://plsale.pro/37432032795e28ha.pdfIn PDF document text
    • http://lalashoppen.online/50189261591rv47.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/Y4lbhcT/jipasaxovi.pdfIn PDF document text
    • http://fbcopyright-center.com/81724112150zp9cc.pdfIn PDF document text
    • http://halfraire.xyz/hotel_transylvania_3_virtual_reality_activity_app_freetwiq5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489992/normal_60055758e7543.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/czy6hjP/10_facts_you_should_know_about_your_boyfriend.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/reportage_ehpad_france_2_replay.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 5632 bytes
SHA-256: fcd5497bb0d85fdcfd965dfc172f8002d82acc4debf6521cb35e6d79e4d8add4
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 10556 bytes
SHA-256: 11bfeb3e4070f876af67947327ca778580a9b5348ddb660f9ea5c178df09f605
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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