Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d56614902d19af…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 17:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e63af9e82e5004fb02aa99078bb7c09 SHA-1: fb200da46a0a656766bc122b84c45729add63d5a SHA-256: c6d56614902d19af89d9c9318d9baeeef24136abb4152ba2e0c8305c0bf7570c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=come+play+full+movie+123
    • http://tubietelbar.hu/uploadfile/sesanafovadonupogimutija.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/bapepino.pdf
    • https://ecpa.fr/uploaded/file/vunokuzusajifinizowo.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/guvosogosofurefikapoz.pdf
    • https://adepotcustom.com/UploadFiles/file/20210921023325129.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a200645280---luvaligupeduzavesax.pdf
    • https://upaspor.com/resimler/files/dasalogewidadiso.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/17186774876.pdf
    • http://mhzsolutionz.com/userfiles/file/volezepifevaxup.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/gizul.pdf
    • https://0286869143.com/editor_images/files/27535841862.pdf
    • http://peak-experience-europe.com/images/blog/file/89634042343.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/refaperasejadovuluwavep.pdf
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/26797613718.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/saloxilutaninetegikozoxul.pdf
    • https://peusch.lu/userfiles/files/60717026666.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a36a3e7abb17d0dd5aa18c97a2ec08c4/55893319825.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fisag.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/58246158221.pdf
    • http://romangruszecki.com/uploaded/file/32074359755.pdf
    • http://splhardware.com/UploadFile/file/2021090515124973499.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/gubopujegolopo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32b.bin
441da258611cff40c083d3bb28712f46012c1307abdbf31bb9a6c289d11b897b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 17360 bytes
font_01_sfnt_off0000df90.bin
f6cacf9da648cc3e6227b0399ea526c7d695834321f19d9704e576a2fb3a94a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 10704 bytes
font_02_sfnt_off0000f844.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16792 bytes

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