Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfa7a71e70269c6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 07:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb414af5816c7c2fb1bcb142036fcb7d SHA-1: 902b61fe2adb539abac59e9414b4277ee05d7318 SHA-256: 3bfa7a71e70269c6db656828433d76533790b1a9fa9abde39a6dbfa706c47204
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to various domains, many of which appear to be disposable or low-reputation, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.extramas.com/userfiles/files/97982151631.pdf In PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/41820613291.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/32797838462.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/sinemademataxiwigo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/62c557d81ee933168d0072eff0f292cc/kesuvodo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/46643797914.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/rimufu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/femef.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/bafef.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/22136545080.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/vevodawebujaganiti.pdfIn PDF document text
    • http://come2menorca.com/images/file/tipemifoposoxog.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/10744539842.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/78311506980.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/2970323015.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wejejaxefovevobo.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/bafune.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210917133147.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lisijow.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xusefenamilozurejuni.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/78371714040.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017db82db4---gudixivagupinimoxibi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/tidewipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=windows+update+corruptedPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 10640 bytes
SHA-256: 1a1b9f3fd2c7e8f625d3a64247f28d21a49eb1d4ac7b0a3eca14c2952ae8535e
font_02_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 16364 bytes
SHA-256: 2a818d0bc9125f5a9969168661f0ff82100428e9cd598208b857a9e58513f281

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