Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7095065d2f22e2d…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 08:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bfe08b080779c72cae56df0cb3ff42a SHA-1: 0a79c14f58529a6f2b62ec069d32b6c8956b08e2 SHA-256: f7095065d2f22e2d2ebee8f3ed5d2a6c58777dc29a54f2c686b5f36a9ca2719b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious destination by using multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6d07c29be.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/forufagonupizovuvojuvu.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/34716037022.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/fuzadegatofaloxon.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/setigasebaroxadojav.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/gajoxowugozuxuzosipogal.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/4601830798.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/23930545479.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907205709.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/ruzexaw.pdfIn PDF document text
    • https://agermag.ro/mm/file/nudivodolikame.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16150f858373c8---17322945706.pdfIn PDF document text
    • http://js-space.de/userfiles/file/wuximobel.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/kuvijijipufos.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/nasozituxemufagewezatiso.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/jefiwezoxubekatogewenif.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/40575075574.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/gezawometotexobutevuxo.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/84617536283.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/95242524956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wifi+802.11+driver+for+windows+7PDF 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_off0000ad39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD39 17476 bytes
SHA-256: dcd5be9c02b7f3753dea94e1e5878292af8ab3365fb374a1762cab12b86b7c96
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10804 bytes
SHA-256: 3a57278a7db226c37e4abde46bb0eba67ecd8acd06b1cbd67938145e90c50ae5

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