Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c96ed8e6eb12ef…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 18:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 829ad60b4ad43e39627dcba1cb5a6e38 SHA-1: 20eb71e3da7e56aee0a68eb2f09ae8b9b1c23cc9 SHA-256: a9c96ed8e6eb12efde867e6b5b38839f092ddef7a83de9a9f58186fe15865a6f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO manipulation or phishing link farms. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=what+does+kills+mean+sexually PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5fca9ae3d576a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fd60b8ba40a2.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/136513761150i7zi.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/diejajj/lawavepavikit.pdfIn PDF document text
    • http://capridigi.com/90959753734uu22k.pdfIn PDF document text
    • http://immortal-sho.club/is_vegetarian_diet_better_for_weight_losscxweo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_601d724ec5843.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/0a3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5fcf44292f01a.pdfIn PDF document text
    • http://luchdobro.site/what_is_the_purpose_of_north_atlantic_treaty_organizationmzak5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fce63c1e34af.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/fazoz-jozirujojawob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_60260894d69bf.pdfIn PDF document text
    • http://jukekabotika.22web.org/effects_of_air_pollution_on_animals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6018635b26ab5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 5216 bytes
SHA-256: 1ab5c9b16c608185a8eb4bc53dac84b12ca5fe00d9ca837d7e39aa3be5b79c3d
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 10812 bytes
SHA-256: d221e49d7988adef045ccbd94020e08a535cd7674434d1d6ffafd205900162f7

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