Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbf88b6605a174b…

MALICIOUS

PDF

74.0 KB Created: 2020-12-27 16:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cfe215dc7f947023f0c43158a46788b1 SHA-1: 2a8ea7899821ccecd2a3915c937b88e69591daf4 SHA-256: 5bbf88b6605a174b20a0d729c3d0f2302aa05828904d474378d0247fc5b2b70f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites.

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://trafffi.ru/strik?utm_term=best+mexican+made+cowboy+boots PDF link annotation
    • https://ririrufazerox.weebly.com/uploads/1/3/4/5/134501654/1951786.pdfIn PDF document text
    • https://dodojojika.weebly.com/uploads/1/3/4/5/134503072/7410716.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/4844578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fe85799f3442.pdfIn PDF document text
    • https://tigisara.weebly.com/uploads/1/3/4/6/134651617/262605f7af9318.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/4106344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f9ec7fc1f6f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f937a7280a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5faaebcdd0646.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/sonegizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5faa7c4822add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_5fb8fae367c97.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/59093f65-8351-41a9-89f5-0bb067ebb6cc/11733327955.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/cardiomiopata_de_takotsubo.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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 5408 bytes
SHA-256: 5dad99437ddd0010bfc6af77f27bdc28ff2ed974725d45b1bc174a16a2627c2a
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 11188 bytes
SHA-256: 198927d02ca2c71f4dd3c089381b1f6136e0b4746a6a3417fd2e16acc284c4ed

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