Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6df84745c4021c…

MALICIOUS

PDF

90.3 KB Created: 2021-05-26 00:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad1c8926ec2d4e7b67488c3f7d26fe18 SHA-1: fc5239f4519e979bc9dc4792f1e2fddb1dfcead3 SHA-256: 4f6df84745c4021cfe792fd3f469f27ca5c13b86c45ba3874abf316d4c91d431
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files hosted on external services, likely intended to host malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=analisis+literario+de+el+caballero+dela+armadura+oxidada
    • https://cdn-cms.f-static.net/uploads/4464878/normal_60411c24c938b.pdf
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/7579254.pdf
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/5914564.pdf
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fd91d385afcf.pdf
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/tekudetitaku.pdf
    • https://cdn-cms.f-static.net/uploads/4454435/normal_602a147c12fbe.pdf
    • https://bilurowunolip.weebly.com/uploads/1/3/4/3/134316979/2863749.pdf
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff04024a52ae.pdf
    • https://cdn-cms.f-static.net/uploads/4381302/normal_6039ac049cedd.pdf
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/zopedusipese_runopiritudi_gavivadu.pdf
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/9248008.pdf
    • https://fadetelipivike.weebly.com/uploads/1/3/4/5/134523249/lunaga.pdf
    • https://cdn-cms.f-static.net/uploads/4413347/normal_6018864aa1b53.pdf
    • https://zevigutuxokalu.weebly.com/uploads/1/3/4/7/134769804/44a4dfed62181d1.pdf
    • https://bewabolome.weebly.com/uploads/1/3/5/3/135347927/5194034.pdf
    • https://cdn-cms.f-static.net/uploads/4462376/normal_6059934eb0cdd.pdf
    • https://static.s123-cdn-static.com/uploads/4366057/normal_5fe39d3e5d927.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1fa691c8-1216-495d-88de-18d0a8a27f0d/moluwerokitomometobirog.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/2998529489.pdf
    • https://uploads.strikinglycdn.com/files/00addd4c-626d-47e9-a69a-2f3333b5f449/how_to_write_an_adoption_story.pdf
    • https://uploads.strikinglycdn.com/files/63bfaae5-c193-4e08-9874-9b608d853f82/zovawam.pdf
    • https://s3.amazonaws.com/pizivurapab/70477521679.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012197.bin
9a15c37802873930f3856f884f52d30c0c02f9ba423bb5cd3c9b1301be0c3b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 5280 bytes
font_01_sfnt_off00013373.bin
8a2b1509a50a2b3477431c876633817e724be4f079b2698763afa3d69e8d64b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 12732 bytes