Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcf802d04f1fefb…

MALICIOUS

PDF

76.2 KB Created: 2021-02-15 23:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9c790c486c8be531f68c24b73fcec859 SHA-1: f2e84c580495edbe5dc0ae511e3c30df973f9c43 SHA-256: 3fcf802d04f1fefb87001e5653fd2d1032a5fd41f396aae4329eecb25c7e369c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document body's deceptive content support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=karcher+honda+pressure+washer+costco PDF link annotation
    • https://cdn.sqhk.co/vozeseseber/ghJggih/jijuvabugowufiteguburuv.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/58hjjhi/27232612506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fe7800b760dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fcf3d89990e3.pdfIn PDF document text
    • https://zefulesemed.weebly.com/uploads/1/3/6/0/136021217/vakisalovup.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/gNQkcid/lojizufepamobiwe.pdfIn PDF document text
    • http://tusapet.iblogger.org/jatuwiwerorulud.pdfIn PDF document text
    • https://tegedibinatamam.weebly.com/uploads/1/3/5/3/135350324/886562.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/oNyj9ja/83702575862.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/zezitok_gawip_rigewipar.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/bkNyrdl/chicken_invaders_3_cheats_codes_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawegoxizifiti.epizy.com/manualidades_con_botellas_de_vidrio_pequeas.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/16715380275.pdfIn PDF document text
    • http://savejanaxejov.rf.gd/muzosipusepozule.pdfIn PDF document text
    • http://kovoxajinuf.epizy.com/ley_de_amnista_mexico.pdfIn PDF document text
    • http://poxemibusap.epizy.com/69842593841.pdfIn PDF document text
    • http://nixuverojezuluz.epizy.com/14390889965.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_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 5192 bytes
SHA-256: 99014a9db07049553c6a2dea146651c5b90e109523b6a3bcc2cbe5a415e3e06a
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11524 bytes
SHA-256: f95a92067bd2b1ab91462c4a20a16705645e3a8041aee9efac7ab1ead90e4969

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