Malicious PDF — malware analysis report

Static analysis result for SHA-256 200a85377aa6252b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 10:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a8a23b56dd35953c54f0ad2fb6c61da SHA-1: ab0c0fbe8919acb6de2b965afcbfcc6737624464 SHA-256: 200a85377aa6252bfbaeb932d34478c2bf6f050e9c26cd4ac83f6d11d8ddeb06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. No scripts were extracted, but the presence of many external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=real+commando+secret+mission+mod+apk+happymod PDF link annotation
    • http://dienhoabacninh.vn/webroot/img/files/95595901219.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/muromuxadogexato.pdfIn PDF document text
    • http://imi.vc/upload/files/tamenijamoboti.pdfIn PDF document text
    • http://onlinevay.com/upload/files/2818311726.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fizovamifetixalisas.pdfIn PDF document text
    • http://onlinevay.com/upload/files/1081791891.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d992bc6f6c2dc3057273bc60216570c9/gugiwenajanu.pdfIn PDF document text
    • https://rjpexport.com/files/tawajixuwadilad.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/22181234185.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/12355778586.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/99711947546.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906051830.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/lufibidepoxotowoz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9df07a8cb4ce791be0e3d6a3e929d36e/75311600946.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/27010489503.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/mosaxifakaboluvoverim.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/sevagejeguz.pdfIn PDF document text
    • http://knipia.com/userfiles/file/zabinededovanukapagi.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/93217239785.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/13765036552.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/74268973983.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/zelup.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_off0000ae42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 17520 bytes
SHA-256: 3cc385429017a09eeeabe157c990a43dfc921d3fa1b50fbb708068f600439d54
font_02_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 11028 bytes
SHA-256: eef308583605e972bed598231b596d16438ae89c5fd27602c9a80a82dc13e909

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