Malicious PDF — malware analysis report

Static analysis result for SHA-256 b757436f3c8dd932…

MALICIOUS

PDF

81.9 KB Created: 2021-04-07 23:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 02c273eb5dd37b432e55b05d2b295658 SHA-1: e79ccca0c82003979cb83eec10bc661052c908d8 SHA-256: b757436f3c8dd93237bbf31f49cb7545476bccf6ab3b3f256347057aa4ccdc5e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL (`https://kuzutuzo.ru/strik?utm_term=how+to+use+klein+tools+tough+meter+ip54`) appearing to be part of a link farm designed to attract traffic. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=how+to+use+klein+tools+tough+meter+ip54 PDF link annotation
    • http://nejamaranidirit.22web.org/vimeo_video_url_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_601ed8e7792f2.pdfIn PDF document text
    • https://cdn.sqhk.co/xarazoxege/w3ic1gi/integers_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_605a6f045dd29.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/BtYyohj/teddy_roosevelt_national_park_north_unit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6015dae9addb5.pdfIn PDF document text
    • http://sokuzise.iblogger.org/undergraduate_algebraic_geometry_reid.pdfIn PDF document text
    • https://fafogefefotal.weebly.com/uploads/1/3/5/3/135314601/6736788.pdfIn PDF document text
    • https://cdn.sqhk.co/sofawaju/8iayhhb/paniju.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/767844.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/3323237.pdfIn PDF document text
    • http://xenuven.22web.org/81166845771.pdfIn PDF document text
    • http://bupadakibagada.iblogger.org/lumujexaxorilenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saliguk.rf.gd/dna_structure_worksheet_answer_key.pdfIn PDF document text
    • http://lujarozukivexoz.epizy.com/lactancia_materna_posiciones_para_amamantar.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/bamogamupabagadusaraxi.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/what_is_boy_scout_class_a_uniform.pdfIn PDF document text
    • http://xegubidutanaza.epizy.com/tezidu.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/59110454463.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 5352 bytes
SHA-256: 06782fe1795e443c8567196ec6271b7dba0e9ce4e964279e0a065e3994eed27e
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 11536 bytes
SHA-256: 65f1a8d019079474bde13f68ba41e792e9a5fb9b8a241b2ec502d1fc00f5f41a
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16136 bytes
SHA-256: e062faff0b5f3d12ef96d17a813e209689a07cec8984531399442ab350abe39b

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