Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26679b24aeddc39…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 11:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cea4265ae44aa203b3e6d1a042724d8 SHA-1: 6822e8910f613c6ea3b10ff74fb0e5adfdbed703 SHA-256: d26679b24aeddc396ea40b355bec6264e120461dfd89ee81bec6697656f4e1d6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to external PDF files on disposable domains, likely to obscure malicious destinations. The presence of UTM parameters in one URL suggests tracking for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

Heuristics 4

  • 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
  • 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://chcial.ru/uplcv?utm_term=vpn+cat+android PDF link annotation
    • http://fiorenzuolatrack.it/userfiles/files/85701330671.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/18569980155.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/84431722694.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/83900092733.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/1607677404.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/vubazatofewejijugafola.pdfIn PDF document text
    • https://granitnet.hu/editor_up/vugubugafunojub.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147abf9f211a---zabivolobatimagu.pdfIn PDF document text
    • http://dfanchem.com/upload/files/totivureloreraditununi.pdfIn PDF document text
    • http://tano-cable.com/d/files/90204528637.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/99670585939.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/91221082635.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341704b2644---sinitozefewubu.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/negexufudiwewegokulowilo.pdfIn PDF document text

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