Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6e71e02595dde3…

MALICIOUS

PDF

85.9 KB Created: 2020-12-24 21:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a03c2bfd90677dedb3c70091ded9daae SHA-1: eeb83155ac328c11fa087d68f4c6bfce02047d51 SHA-256: 6a6e71e02595dde3fddcd4fa4b52ba005d063615a375c00ec35aca6ce151bc1c
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 services, and one specifically linked to a lure for "Zombie Frontier 3" free coins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document's structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/strik?utm_term=zombie+frontier+3+free+coins+and+gems PDF link annotation
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/4506633.pdfIn PDF document text
    • https://nukafezika.weebly.com/uploads/1/3/4/5/134510633/jajolofawudaxus.pdfIn PDF document text
    • https://cdn.sqhk.co/varipivokil/aMVjjUF/65907698409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490128/normal_5fbdb9e11171b.pdfIn PDF document text
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/lokalunejijopifodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fd5f74020e8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fe385ca20e1d.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/jfibFz1/birthday_cake_pics_with_name_mom.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/winumigutam/infectious_waste_management_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/22076313713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea0d292-95f3-4a57-b781-87db4417a892/libro_de_educacion_fisica_3_secundaria.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/vinilazakotogoxofegatapan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 5572 bytes
SHA-256: 4a8d4384e199bf185c30bbeb7d94d3cc30ae5015ec2c60052722f5c9b0046e6e
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_02_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 11072 bytes
SHA-256: 288651ebc147270988147b2959e9b3025ea7b693803348ea6e90686c92bc66cf
font_03_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 16400 bytes
SHA-256: 41bb601eb8db5382dd9c248a201f89c0d83456e298b69f0037536ff718749c59

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