Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e2c94800774535…

MALICIOUS

PDF

77.9 KB Created: 2021-03-01 20:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ca6d1855a852934824b55020214ee92 SHA-1: 687341fe4b9199399dcf67aeae9844394e91d70c SHA-256: 40e2c94800774535c9c5d358fc26aaf9098d23d5f585eb7e00190cf54ea13db9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is highlighted as a potential lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

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://lozipotod.ru/strik?utm_term=how+to+draw+a+face+3+quarter+view PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385427/normal_602e4030c576f.pdfIn PDF document text
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/bewiwibudijanatebe.pdfIn PDF document text
    • http://bupro.asia/road_rage_definition_espanolkq6kb.pdfIn PDF document text
    • https://xojajadajopun.weebly.com/uploads/1/3/4/6/134646320/xonidedoxejizen.pdfIn PDF document text
    • http://dihtyar.online/dipiwiromusujaseqwa78.pdfIn PDF document text
    • http://leyloften.online/zupewumakamasemakanuverv96k5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_601832acaa4c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_6002c2a21372f.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/hjajAii/90_day_fiance_the_other_way_song_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_600c6e6b7fc26.pdfIn PDF document text
    • http://apparently-home.com/26_week_money_challenge_5_000_printablewc6h0.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/6437102.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/nimuwet/texoluxufalufakepasofero.pdfIn PDF document text
    • http://rivudokuji.rf.gd/australian_taxation_superannuation_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/kijurunomusejalezo.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/free_printable_hindi_grammar_worksheets_for_class_2.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/16463749222.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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 5208 bytes
SHA-256: 0ea0e6fb98f09f9fe2646868a60dfffa81a504fffe5e9ede69e9d38125026011
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 10636 bytes
SHA-256: f6efd0bb4d6e0bc6525482d887feba31dbe672d96920f9507e5c8d129e515dae

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