Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c194342da9de13…

MALICIOUS

PDF

84.4 KB Created: 2021-03-02 20:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4ad94553bbaa5f5c681c9d392c9fef88 SHA-1: 88d38403f75671337e0a15fab7dae83ce6d6f9c3 SHA-256: d6c194342da9de13e314e4c2eecc47eb20abeee8b696a911093bcfe2031b0dc6
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. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting and potentially malicious domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://dugedepap.ru/strik?utm_term=dell+b1160+ink+cartridge PDF link annotation
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/f7c5f87e.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/jjhbKGA/facebook_logo_for_business_card_use.pdfIn PDF document text
    • https://radobejaka.weebly.com/uploads/1/3/5/4/135400195/peverilunavo.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/W4qPQUg/f1_schedule_2016_japan_qualifying.pdfIn PDF document text
    • http://helpcreditscore.info/rikki_tikki_tavi_story_book_reviewh8csb.pdfIn PDF document text
    • http://nudistoff.club/sanuvipirinaguwhxm3j.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/xYY9Ajd/trending_hashtags_on_twitter_worldwide_now.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/dyson_ball_hoover_cleaning_instructions.pdfIn PDF document text
    • https://kesetemokeze.weebly.com/uploads/1/3/2/6/132682820/kixituwonamolutexum.pdfIn PDF document text
    • http://armada.technology/kogozoreworatoh51.pdfIn PDF document text
    • http://merewawasisu.iblogger.org/29063150952.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/nodimaf-venin.pdfIn PDF document text
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/259597.pdfIn PDF document text
    • https://cdn.sqhk.co/dutigimomana/hgfiab5/burger_king_near_me_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://popofisofol.myartsonline.com/why_my_dyson_loses_suction.pdfIn PDF document text
    • http://fukesok.rf.gd/97353895159.pdfIn PDF document text
    • http://jupasugego.rf.gd/picsart_pro_mod_cracked_apk.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/sepokajuvujotokitolozofi.pdfIn PDF document text
    • http://getojigukas.epizy.com/chief_architect_home_design_software_free.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_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 5480 bytes
SHA-256: 6cfd4d762697fb4a5e1e88be5e63d7002899d41d062abf0e3c760667c60b6f87
font_01_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10952 bytes
SHA-256: e25a1e73b87439a1d59db5e72f406224247d7820d76893d29a286e510fd96543

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