Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c8e01a143c6243…

MALICIOUS

PDF

73.9 KB Created: 2021-02-28 14:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 716363f93d68a94a12b39fd35aa291f2 SHA-1: 2eedbc6b932cebb19b574f88f4c27de64dfed531 SHA-256: 02c8e01a143c624324d033323c7fb01da897217b44bf845a4f2f70bc00ed042e
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious campaign, possibly involving T1059.007 if JavaScript was used to obfuscate the links or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://vilenefex.ru/123?utm_term=the+seven+spiritual+laws+of+success+deepak+chopra+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424630/normal_601d64471f1f5.pdfIn PDF document text
    • http://lighttravel-ng.com/rawozevabafuvubodmy3vy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_60290e0aef0e5.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/what_is_the_new_burger_king_impossible_burger_made_of.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_6020a14730fb4.pdfIn PDF document text
    • https://nafugawiwira.weebly.com/uploads/1/3/1/4/131438392/3b4e012e2f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_603b426681732.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/zexon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_600dc1184462d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60259abaa831a.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/siruretad.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/how_much_water_should_i_drink_a_day_to_lose_weight_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5ff86bae07aec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414164/normal_5fff9b95bee8f.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/ee06483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_602ed4a2ec043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/86873338144.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5408 bytes
SHA-256: 791d4e852ac72f4db5554c91e4a5ed5ce7cf6077d76348be6b57098a3fb66286
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10388 bytes
SHA-256: bedeaa5901fcd2bde019c510f85fef6605701f87262918dc3a693cae76e69025

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