Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85e53cfaddbc957…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 09:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9f4f011279bc78238daa7865d8b286f9 SHA-1: ac137cca674f07aa9c1f28aa1927226c232fccb4 SHA-256: e85e53cfaddbc957162d956e3033a090a8b27ad9110e620a5e0b08c21ded4caf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://sonnenheizung.ch/fckeditor/editor/images/file/buturirimoke.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38d0b438c---losolipaturejozusufatako.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/bokulamugokixasuma.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/seboku.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/ladesevuropizamowinagemo.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/tuvegoduvezuzitenu.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/sanixiwevolupofukeg.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/46754428819.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/newotarewil.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/44912603856.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/rigebelutegixini.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxazomunavesasuxi.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/pigoramikudadomovi.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/vapikulegixugezi.pdfIn PDF document text
    • http://reflita.lt/uploads/files/60060707678.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wakadufefivede.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/gimuxowegonuruxojusizogi.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/basifizijubilirotineso.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/senituviwozegim.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/42256373553.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/47968431579.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/24965309320.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100910507246.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/65896226921.pdfIn PDF document text
    • http://dr-temt.ru/images/file/lulolexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fear+the+walking+dead+streaming+freePDF 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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 18092 bytes
SHA-256: 24eb26cea7816dfa5a8a2dfc0d860917bb0816f36286f4346f3a00775ee40cc5
font_01_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 10836 bytes
SHA-256: 58b30acdfa6cf8ccfb6c1b04cd938d4ca32e08b79024364c8264083b3eb8a003

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