Malicious PDF — malware analysis report

Static analysis result for SHA-256 522794f9701c4bde…

MALICIOUS

PDF

88.9 KB Created: 2021-03-05 14:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6ae2fbd8c06ad1762659d778072b0ad8 SHA-1: 75407e10e1482cc0d2b0080514e41a45b41f81f7 SHA-256: 522794f9701c4bdebd84bf69f640a21e690f5451fede58a36eaff30d9acc41ab
126 Risk Score

Malware Insights

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

The PDF file 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 'zajinet.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, often used to obscure malicious destinations.

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://zajinet.ru/123?utm_term=how+to+change+the+date+on+citizen+eco+drive+wr100 PDF link annotation
    • https://cdn.sqhk.co/zoxinugokas/idQiehc/3d_printer_filament_price_in_pakistan.pdfIn PDF document text
    • http://zerudomafiko.iblogger.org/jafovubalusu.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/jjg8gjK/santorini_archaeological_museum.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/bifgjuw/zegezopuwepen.pdfIn PDF document text
    • https://cdn.sqhk.co/fanasuzajem/gfdhgTZ/93977502983.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/juoKCn6/12547945539.pdfIn PDF document text
    • http://nepifenimet.iblogger.org/3cx_outbound_caller_id_format.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/b9p1Kgd/supreme_stickman_battle_game_fight_warrior_duelist.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/igggfib/11383239709.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/zerepuzuze/zukalokuganumaneduxexataz.pdfIn PDF document text
    • http://fivulesesixiji.epizy.com/classroom_behavior_management_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/wunanuxowezuwudi.pdfIn PDF document text
    • http://neropexuzex.rf.gd/80620280836.pdfIn PDF document text
    • http://pakifisaxere.epizy.com/what_do_you_say_to_someone_who_is_stressed_about_school.pdfIn PDF document text
    • http://woruzuxolalov.rf.gd/weweso.pdfIn PDF document text
    • http://donofetesexok.rf.gd/borrelia_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/bsplayer_pro_2._70_serial.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/lemofidazosatimaniw.pdfIn PDF document text
    • http://bimomog.rf.gd/11305123943.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_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 5348 bytes
SHA-256: 4548f050162a821611366c1ffe6a36b8ecc610c9c3e0e56ffa61c598fd5a57f5
font_01_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 11488 bytes
SHA-256: 9b61f03017647ad9f8a7de9925c6d08fc09abc3d4a954da69b5cf94c2ef617e7

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