Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb287ed3eb84d61…

MALICIOUS

PDF

74.3 KB Created: 2020-11-24 14:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 54a931d48b9a3eaf4886c9adca6b386f SHA-1: baf908411ab8b10ca23b804e43d64c9562488099 SHA-256: 6fb287ed3eb84d61f4c7a65de7a349d8d59958ac7993f607f14cfb2f5c5560c0
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffking.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is 's3.amazonaws.com/jagux/barofiwijuvi.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware 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
  • 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 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.
  • 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://traffking.ru/strik?utm_term=ga+tech+korean+student+association In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_5fae6be6e07c8.pdfIn PDF document text
    • https://fusibeze.weebly.com/uploads/1/3/4/4/134434453/26b74d9e5d81a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fa3969b08812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5f9ab1d0cc3c5.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/jagux/barofiwijuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/joint_information_system_jis_does_what.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/autocad_3d_learning_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/ford_engine_codes_p0171.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/69670753385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936ce55b-79cf-4bad-b430-826bc5900218/tadafigosigad.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/10476416020.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/cafe_business_plan_template_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/pojitowezozogolaroxe.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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 5088 bytes
SHA-256: 3d265befcf187c32c6e1d3b48a4cb0f1350b15c7c2b1da738a234a6b89aa8c0c
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10924 bytes
SHA-256: 01de66b1b583c0ee3dcaac1a265b83b9d63fc930435cb401f101c9cfe51a0703

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