Malicious PDF — malware analysis report

Static analysis result for SHA-256 6902d98d2c46d701…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 14:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fe6098455bee9e29ee7e0615c83b62a SHA-1: 9571b2db95b0d6bdf7b47a68c6a2e2166c0b7e10 SHA-256: 6902d98d2c46d701cc4e9e65e8d4d68a6433ca576d2ed3968925b791d3ab9d3d
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 domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://protok.pro/upload/files/mesavabonimowanufikolaju.pdf
    • http://ozgu-yapi.com/firma/files/xopetepimig.pdf
    • https://geneolock.com/ckfinder/userfiles/files/52808614421.pdf
    • http://farmaciafoglia.eu/userfiles/files/71878473423.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/pitamekugaxemevof.pdf
    • https://detectiveoffice.net/userfiles/file/23748440905.pdf
    • https://worldmedglobal.com/userfiles/files/dexax.pdf
    • https://maria-galland.ru/files/file/zuzubekokolofetuto.pdf
    • https://gdaniec.com/upload/files/58554194582.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bc1bb4a43---7062368972.pdf
    • https://gifarlcm.com/upfiles/editor/files/sugorovoropelesizunapuf.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/logitewoxamebipuwepo.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/nemetidom.pdf
    • https://gym-rectif.fr/ckfinder/userfiles/files/43878302577.pdf
    • http://learningkey.org/userfiles/42381153799.pdf
    • http://www.childofafrica.org/media/userfiles/file/22377554490.pdf
    • http://massiimo.com/piceditor/file/sasulexekakip.pdf
    • https://lotte-ppta.com/beta/assets/file/betomokamavesa.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d55df98eb2---1254269673.pdf
    • http://moiarchitekci.pl/pliki/file/49528396313.pdf
    • http://mishor-uvk.com/uploads/files/90225300309.pdf
    • http://hanahana.vn/media/ftp/file/99187649716.pdf
    • http://www.39koratmachinery.com/file_upload/files/gijomivuzefezomu.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/33814223572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cryptotab+browser+pro+for+free
    • 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_off0000b95d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 16792 bytes
font_01_sfnt_off0000d16f.bin
9e0c578ad9cfa8e1bb3b7c436b8df2bde46857259961fe574f10d06ab8a4a88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 15788 bytes
font_02_sfnt_off0000f9b5.bin
ed0709f90d9f7ead0bcc0ef63dabd665baa4f88047b7dae6bf46a670e9f0978b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 10480 bytes

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