Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0f4398bd25a741…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 15:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 399de6cea79444adcb8f883dcdfa2e1f SHA-1: 07ab7e4b8a159569bf2390e49381021668b6402c SHA-256: 9b0f4398bd25a741bad5fd36ee0634ca9d537e1e75e7ebd7fc00cfd451547334
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sangtaoad.com/uploads/userfiles/file/daxadakozoneradinelekezo.pdf In PDF document text
    • https://faceless.me/userfiles/files/57110989968.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9250983395.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/943649629.pdfIn PDF document text
    • https://ntc-container.com/upload/files/pinesevigox.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/zupigipesoxuluzenuteguwu.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/judelizole.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/funulalavimux.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/51581837574.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130000cab04a---37906802720.pdfIn PDF document text
    • http://origo.ws/userfiles/file/gukesewuzurap.pdfIn PDF document text
    • http://z500.si/files/vowejule.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/vuraz.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zokonoropofekumidi.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/kuzafekisepinanosofif.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/gosidafufotukita.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/lazigawawikedazalo.pdfIn PDF document text
    • http://enewind.com/pliki/file/72382898417.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/luzejavaxebelujukoxore.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/63040608271.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/wenaduranines.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614728292b565---73780080320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gboard+new+updatePDF 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_off0000b07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 18652 bytes
SHA-256: d94eff4850cd78ce8073c222768e1ed1998debf6e94f3579e4d21020a1266549
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10444 bytes
SHA-256: f4a7e3023135e87ed6decefa54a37290c7d41e8e5a672724f9c02ba49433ec00
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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