Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55f4a789faab18e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 09:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20a58878e361a141f8500f53ca6c3db5 SHA-1: 82243fc6030b371127f5cc8611685fc4c91df0fe SHA-256: c55f4a789faab18e749a9b6be306455950a4a52f1948806c63f5c4b4a4f93d15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=ocho+apellidos+vascos+streaming+gratuit
    • http://leadingedgecorporate.com/user_images/file/34679207808.pdf
    • https://chataigne-cevennes.fr/imgs/files/wubemaforitovupeporikuto.pdf
    • https://nomortiga.com/contents/files/gowinoxegid.pdf
    • http://kengosushionlineorder.com/uploads/files/21705868259.pdf
    • http://brmhn.com/userfiles/file/20210916093423_ybuj27.pdf
    • http://augustaelectricalwork.com/editorData/file/bakokimakelofatogo.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/volemuf.pdf
    • http://edv-denk.com/userfiles/file/18494949089.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6762e6c09378b2607549fbf779ec7958/didutaluzetigedafupe.pdf
    • http://dkstores.gr/userfiles/file/11113372086.pdf
    • https://delcinfo.ru/img/files/files/lonito.pdf
    • http://dongduong.net/Images_upload/files/58766270876.pdf
    • https://tectrongim.com/uploads/file/57850827730.pdf
    • https://e-room.co/userfiles/file/97348969203.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/80101107515.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/rogatoromunuba.pdf
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/tofovidex.pdf
    • http://misterholidaysanprisco.it/userfiles/files/gumabitisina.pdf
    • https://cornerstonelaw.eu/userfiles/file/fitejenovo.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/67918468503.pdf
    • http://nessie-vinylcare.com/file/lowiros.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/29431972770.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/24731049597.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/kuvefigarepikiputulo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c36b.bin
070cd486958e2f6378979eaa5ec0939b7ac281d5e1f5b25c2edd39022d807dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 11152 bytes
font_01_sfnt_off0000dd26.bin
350e5254458e93dd23cab9877b356bfd0f9d2120366775ec7cb25c4ab5241834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 18420 bytes
font_02_sfnt_off00010c6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 16792 bytes

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