Malicious PDF — malware analysis report

Static analysis result for SHA-256 6769b4ca1c9b1e0f…

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 23:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4525273bf52df92d48f2ffade5dd70ba SHA-1: b35c2db5f55a793b1984b647fe3d404cbbdf194f SHA-256: 6769b4ca1c9b1e0fa5d246c46c4644799f80ed001cb590bc0f790c82e5ef3293
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

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://leonvi.ru/123?utm_term=delta+11-990+chuck+removal PDF link annotation
    • http://maska-respirator.com/sistemas_de_manufactura_flexible_en_la_industria_ejemplost29b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_601addb0bd123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6026d28a17f07.pdfIn PDF document text
    • http://auth02mobility.com/define_configure_in_a_sentencetwxhf.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/aambala_movie_songs_free_320kbpsibcgb.pdfIn PDF document text
    • http://idealica-co.site/pathfinder_adventure_card_game_rules9jext.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_6025ecb6b2ac1.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/VKESNij/red_ball_5_videos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372087/normal_6004d6b5193bc.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/jhKEhb1/best_ninja_turtles_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nemowuroniru.epizy.com/human_development_report_2017_gktoday.pdfIn PDF document text
    • http://vewamekigobuzuw.epizy.com/materia_y_energia_3_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/four_rules_of_negative_numbers_worksheet.pdfIn PDF document text
    • http://vowafipefazasex.epizy.com/baby_sleeping_bag_tog_guide_nhs.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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 5368 bytes
SHA-256: 08d66d4cceef65b2ef84a42fdabc0c783a64eb6fc38932321f9a5bb136f64c32
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 11268 bytes
SHA-256: 588c4daeea06a68f345e1ca93940d463bcc047898b2145ae21dfd7ea34dda6c5

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