Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fb9cf713f66478…

MALICIOUS

PDF

84.8 KB Created: 2021-10-05 18:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db86b3e5674e7a3c2f267b3a59720471 SHA-1: 6c41942861333f148c2fba3ada584cc840192da2 SHA-256: 67fb9cf713f664785d7ae30c36c6a036776da37f2cb1e9b4caacd12b9654f888
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external domains, many of which are hosted on disposable or unknown sites, suggesting a link farm or phishing operation. The 'Urgency / deadline lure' heuristic further supports a phishing pretext. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://mikomisushi.com/uploads/files/81277021474.pdf In PDF document text
    • https://fizjolech.pl/userfiles/file/12968374571.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/98224710613.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/47889638344.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/76039262133.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/majeguwitoze.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/feborelejokizepirotex.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5fec65bb---42793443449.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f539606cac4106abbc217232db251f01/41472681321.pdfIn PDF document text
    • https://songhong.info/userfiles/file/bivujokolelurazokovese.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/59848315762.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/jojipogapu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021100508162865674.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/29506589313.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/soromatefalonegemutupup.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/54995988649.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630695866343748903.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/72314450878.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/72218889215.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/6290751114.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/tapujofezizagujufolop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=research+methodology+question+and+answerPDF 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_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 18152 bytes
SHA-256: 10b67dd6fabddf7d2613c89b9e344ffa85f0358902aca45e6f2466158d27e556
font_02_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 11308 bytes
SHA-256: b7015b65fb4fcc1cf9633b091f7c1cba72029e8835ceb0a4a0e2337aad2c04ac