Malicious PDF — malware analysis report

Static analysis result for SHA-256 376c3946003c1fd6…

MALICIOUS

PDF

99.4 KB Created: 2021-09-22 16:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e73f382e4e88fd790c6229fd7a7d7756 SHA-1: a49a88fbd27f6d0bb16312bb8ca246891ab6d7d4 SHA-256: 376c3946003c1fd67c1d54787209c34a49ae44b16357de6da56f80017a920504
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal the document contains numerous embedded URLs pointing to external sites, with one specifically noted as a link farm on disposable hosting. The presence of these links suggests the primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=top+online+education+platforms+in+world PDF link annotation
    • http://ebd.su/UFD/7623/files/midipetasap.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/25623320716.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/voxobiveludu.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/71780420869.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobozaginaxanir.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/60551714311.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87153556950.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/9079120247.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a41cb7639a---dituxemixufutijubod.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xibawibulinefono.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/voxajuta.pdfIn PDF document text
    • http://goldmustang.ru/files/files/27578466323.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/88065181844.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nawiriromudo.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/30605950394.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fevalemusili.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/jafimapipepawez.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/74955526864.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/fasajesukusit.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/50226654155.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/sijinapaxadopuwadekijop.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://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_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 17436 bytes
SHA-256: 4635d8470b274fdbaaecba334883f6eadbd2b1d706022436ca736e6739a57acf
font_01_sfnt_off00014e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16668 10928 bytes
SHA-256: baa2a31a36ba8f013ee28c6450434f9d6ac3f9b768303d78d424639ca083e1f9

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