Malicious PDF — malware analysis report

Static analysis result for SHA-256 9729eb9fc5ad38c9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 08:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c8d39833d411f9daea256a540972ff2 SHA-1: 66422b496bfbbbd0cda8ec0120cf3f78a75b2c93 SHA-256: 9729eb9fc5ad38c9a407192b4247f1a5559782e8060ae6b0ef9ede6b9c489b5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms and disposable hosting, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

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://loppisidjupdalen.se/images/uploaded/file/kuvibewumajebexakotizib.pdf In PDF document text
    • http://mindennapi.hu/upload/file/vovedunukitumosi.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vepotowu.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/46852641288.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/11425684047.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/3124109836.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/gujolagujes.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139db89c81af---vuxisuvaforuwonebuz.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/fapomona.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/33336057897.pdfIn PDF document text
    • http://lex.tj/img/file/dexonezurekode.pdfIn PDF document text
    • https://hoongnau.com/upload/files/tufaxexarelis.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/77049325466.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/13669855302.pdfIn PDF document text
    • https://auto826.com/uploads/files/vokukedawoz.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/22426472261.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/72066598784.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/43042857148.pdfIn PDF document text
    • http://abworder.com/uploads/files/27078416375.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/78251699826.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/87848038012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=psp+gta+5+androidPDF 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_off0000acd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD5 16376 bytes
SHA-256: a66f221360f19e478333f722bccd546bfb297ec105cdd649d2be9ad61c466c14
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 10524 bytes
SHA-256: 46020212052ed8af59c4413d8f2c7d2e10f09c2ba5ffa0a7a99d1aec03778597
font_02_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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