Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bfd42c4a4625bd…

MALICIOUS

PDF

81.5 KB Created: 2021-03-09 04:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ca1c528b447a489a77ec5a63ea3bd568 SHA-1: 52c50866d8a4b51ed1828b28b40dcdd61b606f30 SHA-256: a9bfd42c4a4625bd7c85b3568c6c1d63425652d75b0455685e4d1e49d7254d66
126 Risk Score

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. The document contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting it acts as a lure for users to visit a potentially malicious site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=cat+vs+dog+io+game+unblocked PDF link annotation
    • http://opros.xyz/the_little_sas_book_sixth_editioncw0el.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/mechanical_engineering_colleges_in_virginia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fc5f5bb9d1a3.pdfIn PDF document text
    • http://bigwin-1xbet.fun/camunda_bpmn_autismoq9pc1.pdfIn PDF document text
    • http://mobile-media.moscow/lamiwetelojuweduq5jvh.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/how_much_weight_can_you_lose_on_the_egg_diet_in_a_week.pdfIn PDF document text
    • http://thepropheticapp.com/883304579071lt4y.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/43444150781.pdfIn PDF document text
    • http://organicnu.info/free_slingo_games_no_downloadkioxj.pdfIn PDF document text
    • http://genoray.pro/87970399115psefb.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/cant_help_falling_in_love_chords_uke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fe3ecfa6cf8e.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/gofilafixu/32209308013.pdfIn PDF document text
    • http://womawujun.atwebpages.com/physics_for_scientists_and_engineers_by_giancoli_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/95579970661.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/argumentative_essay_topics_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/who_plays_violet_in_a_series_of_unfortunate_events_movie.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/gibelateke.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/what_is_the_zone_of_proximal_development_in_the_classroom.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_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 5332 bytes
SHA-256: 75981fdbd112dff30a3677da95b3ceafdcc92e40c09aa6474ede66ce52eb2e52
font_01_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 10148 bytes
SHA-256: 1c2ee260c884ae378f6d3076a26001cabfc014002fd752dee3b4ee171bc325cd

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