Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f228d523e3945c7…

MALICIOUS

PDF

71.9 KB Created: 2021-05-06 09:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a24bef6bd9cc3eedd5c33755f998f857 SHA-1: e0964db046cd0181f5245c972ae7be11e898a645 SHA-256: 1f228d523e3945c7d11a6125f77b5fd150e2900a89a9b99a5f63217bf84ffb4d
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 embedded URLs, particularly those on disposable domains like mezovuduw.ru and vigastlens.xyz, suggest a phishing or malware distribution scheme. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool often used to generate PDFs from web content, further supporting the idea that the embedded links are the primary mechanism for attack.

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://mezovuduw.ru/strik?utm_term=at%2526t+dect+6.0+expandable+to+12+manual PDF link annotation
    • http://vigastlens.xyz/vocabulary_test_online_for_greknpwt.pdfIn PDF document text
    • http://stavki-na-sport.site/brown_bear_brown_bear_printable_book_in_spanishm5shv.pdfIn PDF document text
    • http://pasoxegidameso.iblogger.org/aftermath_of_world_war_2.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/obras_de_fray_bernardino_de_sahagun.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/63047211591.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/amharic_bible_verses.pdfIn PDF document text
    • http://medicalpracticementor.com/532476578266erx6.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/samopakamefap/asphyxia_tokyo_ghoul_re_piano_sheet.pdfIn PDF document text
    • http://zesinav.rf.gd/97892941621.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_d5eb83cc034a4b43af209b45a15436e5.pdf?index=trueIn PDF document text
    • http://zobuxosem.rf.gd/19190395069.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/competency_questions_examples_and_answers_police.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_2dbebc93dc0f43bd87c48ba63d40f7f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/wiwefomiduwuvemi.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/how_to_install_directv_receiver.pdfIn PDF document text
    • http://gisaxuzarufol.epizy.com/5016406262.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 4144 bytes
SHA-256: 342af526eadab6d280a6c9b5342a94db61f67a18ab89ad67ca4126a2bccef53b
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 12632 bytes
SHA-256: 0f7aa7f691ad7c6a761306fff18ea7cc579eef152389c9c21e9e68e9629a604a

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