Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87931f3e67826dd…

MALICIOUS

PDF

61.9 KB Created: 2020-12-17 16:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cedbef851a8409d87a6223cc222f948b SHA-1: c8698b9aedb3daf1ce02e2f40bd017918564884e SHA-256: c87931f3e67826dd9bea4af7fb64eee8a3125436b2999d156267769d0cfd386e
184 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to known malicious infrastructure, specifically a URL on 'traffine.ru'. The document body, though obfuscated, suggests a lure related to a quizlet, likely to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=what+did+the+english+factory+act+of+1833+do+for+factory+workers+quizlet In PDF document text
    • https://zukiferadisuxa.weebly.com/uploads/1/3/4/7/134774344/650516.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zewum.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/buvafedomu_pemavoxiwidilu_muwusuve_novezajivize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_5fbb6dbba58cb.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/4435422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fa2d35aa8184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5f964b3bed1dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcee4a13-ac0e-4582-a789-6e9001e68030/89013582370.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/el_capitalismo_en_mexico.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc137400b6b03258f37a4df/t/5fc55c33f8cdb769c696618f/1606769715621/dufotaxaxavepifavub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0743eb-05e2-4ed2-83d8-9ed8bd06ede7/70188593693.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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 6140 bytes
SHA-256: d2b4e308e4224329ba66118c8cd5ef32c3ecc6e0faa4ba88032f794805f9ade7
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 9892 bytes
SHA-256: 556fe2d0e7e31d3e3008377e06d8dfef1ac640abdb3cc8b9d9b2da55b3799073

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