Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf4320ac1ef09eb…

MALICIOUS

PDF

72.1 KB Created: 2021-04-06 12:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1ef456d10a72c485c5def1aa5706668 SHA-1: 3444ede94075f5f2afaed12f9092c7c17447ced4 SHA-256: 4cf4320ac1ef09ebd8b8c1094519472902ebe7b0d205ecb3288d8c1c6414dc1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/wix?keyword=google+password+recovery+crack PDF link annotation
    • http://janorewaxeno.mygamesonline.org/79813079374.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/T7bhdHz/60975909662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_6051a9765b435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_604e286b4583e.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/juserozowaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_6068cc75d0e39.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/92840060743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_601af3eac321c.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/hfgfgdd/90796724533.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/xuvawu.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/migCyie/60416310815.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/wazotojemov/ravolovatejedavonasugagij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e9816d-893d-4d33-8a02-59a0911f8b77/incantation_and_dance_john_barnes_chance.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/organic_chemistry_reaction_chart_level_3.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/who_owns_the_news_organizations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c531382-b989-4f7a-8ef6-9d4e44ea5523/bevitumep.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/78656483872.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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 5592 bytes
SHA-256: d981c670b00232d54c1bb9ee6c700413ac3c4a1d84f63a9c763ad76e00623397
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 11480 bytes
SHA-256: dbb2fe1e407628cdcdb4481776bf7595fee8ed3390564cf525446d4b9b0a859f