Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43543c664231141…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 11:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b1d92d9fb3668541a35d00f8c9678d3 SHA-1: 93a0e652394a8606588c857be10e53428d1e5e07 SHA-256: c43543c664231141518634fc5e5a9f31ba2b9134776454c8b334c7e5e2cf95ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are part of a scheme to obscure the true malicious intent. The ML classifier and ClamAV detection strongly indicate malicious behavior, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://oniceh.ru/uplcv?utm_term=call+of+duty+mobile+obb PDF link annotation
    • https://moraure.net/js/ckfinder/userfiles/files/59957540561.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/3144136358.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/buvakunenumevunakupine.pdfIn PDF document text
    • http://airfa.it/userfiles/file/zikevevojetutalo.pdfIn PDF document text
    • http://elpijisystem.com/file/bewetujimox.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/xanujafosotanupegamet.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20211001_DBC9FBC1561F21CC.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/25631739893.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/ridomolovafekemoje.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/802103011.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/lolovitonekogubimezorebat.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/zokirabolofepemonuk.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/89720401244.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2e189f6c---nafafodesoniju.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/94269159966.pdfIn PDF document text
    • https://petikdaun.com/contents/files/lebizetibibudexanaxu.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/51896995384.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/disokoxewalapefupetisoku.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/18706095503.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/sajapug.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/nitivepuwonobivuvi.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/76289855214.pdfIn PDF document text
    • 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_off0000acd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EF 10528 bytes
SHA-256: e0a0313b587467eaf871e33f83ecc0dc2e56db7dc4ea165c898fe24992e174c8
font_02_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 15304 bytes
SHA-256: 2dabd4448d36f80cb31dec80e2b77301472fe1e7754e1c039dd0f805961f7323

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