Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2043b8f78f2237f…

MALICIOUS

PDF

78.5 KB Created: 2021-02-17 05:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 15f0e18350035d6efc57bed5563d8f98 SHA-1: a21226c397ddce4f61a206723a4127507e537386 SHA-256: e2043b8f78f2237f3ed795356cd7a8342489299e4ecd09f534dea59724ad77d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://seumenha.ru/strik?utm_term=casio+g-shock+protrek+pathfinder+solar+watch-waterproof PDF link annotation
    • https://cdn.sqhk.co/kibizatududo/eQgfVLf/manchester_united_tickets_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5ff0317641801.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/iKTicq5/48298927076.pdfIn PDF document text
    • http://shtangye.xyz/zivutudirapojanajegelj61hc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_6012e397cdafc.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/developing_writing_skills.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/1780848.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/5jjGsfC/3d_virtual_sound_experience.pdfIn PDF document text
    • http://bapipakaroxi.22web.org/23061065973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesirezajirenu.epizy.com/18840211874.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/hack_asphalt_8_android_cheat_engine.pdfIn PDF document text
    • http://nipuwiwabo.rf.gd/85488984820.pdfIn PDF document text
    • http://xogowakowokavuw.rf.gd/kexobavowixapefe.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/vitamin_b12_davis.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_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 5512 bytes
SHA-256: 9a7f298883fc7ac98d99467d76e50d6f211d11ebbab89bf5f941cc9f6e92b779
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 10568 bytes
SHA-256: 2a1e5a995e5fbc636054114312c9d198aee67a2c9de3a8f776ddc980a62857c8

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