Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed2e6ca4b38b980…

MALICIOUS

PDF

79.2 KB Created: 2021-04-14 05:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f2839663c87728dbee44ac6412b31a2 SHA-1: 78291e49bba39ace2001c12b1d2cb7660c11c29c SHA-256: 2ed2e6ca4b38b9803739032dc230842a162e4d5bb11b18387240a67596a3d571
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to 'kuzutuzo.ru'. Heuristics indicate this PDF is a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

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/strik?utm_term=the+real+book+b+flat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529281/normal_5fdb753b63322.pdfIn PDF document text
    • http://poopo.ru/michael_swan__catherine_walter_oxford_english_grammar_course_advanced_oupcdoxv.pdfIn PDF document text
    • http://alsamcctv.com/oratory_speech_formatkt4qx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5fe140824c934.pdfIn PDF document text
    • http://jujigosobo.iblogger.org/74925525694.pdfIn PDF document text
    • http://namedaun.fun/vintage_ornament_vector_freeo7xnu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watenumedar.rf.gd/tp_link_tl-wr841n_price_in_nepal.pdfIn PDF document text
    • http://felubumasosazi.epizy.com/asus_rampage_iv_extreme_m.2_ssd.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/what_led_to_the_progressive_education_movement.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_8a828f030a874985bbf97f2d16df5dd1.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a8a0d96fc65f4ff0a646dcedabd2a1c4.pdf?index=trueIn PDF document text
    • http://toratolobojede.rf.gd/general_characteristics_of_academic_writing.pdfIn PDF document text
    • http://surigel.rf.gd/chitsitsimutso_choir_songs.pdfIn PDF document text
    • http://ferovugosewago.epizy.com/13266433249.pdfIn PDF document text
    • http://lakasixes.rf.gd/kafisonavixozusujujo.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_7c6e3a3ff46146fb8f4da0aeabbbfa44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/mufikuroxaxorogapi.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/secured_promissory_note_template.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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 4828 bytes
SHA-256: f81f8b71c1b9a06190d20daafe79f32abd10b9f91b7461346f5359e1986774e6
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 11432 bytes
SHA-256: 97c5c11bdb186a0f83fa30b39c95cc21663dff975d3313e1ffeb826a26c7c061

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