Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1050185deb6fc2b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20c226a25208727ab0edd4c6ba523559 SHA-1: c97dac3de1b74fa1370c9629350eb3c416fbdf13 SHA-256: f1050185deb6fc2bf28a3446cecd424c5e916f5e4ddd0c119312069b147d0602
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or a second-stage payload via the embedded JavaScript and linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://finalstage.biz/js/upload/files/susupakuwa.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/279fbfc043df6cb01d49882101227a93/julifew.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/45396435994.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/tunilamavolatakagulopeg.pdfIn PDF document text
    • http://thepducphat.com/upload/files/63710140110.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/46768044223.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fafoposepurer.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/87955098511.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210908101828.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/tuvitobedaneb.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/97998795705.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/tewosofunejefikujemuwit.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/21590822127.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///pujetakuka.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b97e91283---vodagobadoxaxamozogarera.pdfIn PDF document text
    • https://akemi.ro/hirek/file/36402108827.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/92986553611.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/17110456698.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/muzilebonadalijiz.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/87614201654.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/keravinokokole.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/25752855004.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wixejiwukoluwutiz.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/xivodizasimiposekugibexax.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/tobarazove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+movie+download+android+tabletPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 14280 bytes
SHA-256: c00b873c416974518336476b968d184a614be69ee88c0095119fc3906a6a5987
font_02_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 18648 bytes
SHA-256: 12b013aff77110e236a243d5fceb8e4bcfb17dca600655fe4519d03da755f466
font_03_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10512 bytes
SHA-256: 299874f8a58658470d7a781b6a02d2d77233fc7bf40bb254be71d206f93d597b