Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b263134e042d42c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 07:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11d54ce49ead873e76e559588186eb0f SHA-1: 0f08ebf1bd36a4477d41f197b18145cabc5bc55f SHA-256: 9b263134e042d42c4e8970a5967188f0e8885d1fbb5bc778d4a5a2439e2b4aae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score further support its malicious nature. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=warhammer+total+war+2+cheats
    • https://przyklejki.pl/userfiles/24262991795.pdf
    • https://promoform.coreform.it/uploads/file/90995961739.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/sixoxadixekazaga.pdf
    • https://satbietthu.com/luutru/files/56263147186.pdf
    • http://medtravel.lv/images/hand_uploaded/files/10540951713.pdf
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/gakadalekit.pdf
    • http://dinhviht.com/images/newtech/files/nuwodizilesinomoboso.pdf
    • https://bachson.net/upload/file/rudepador.pdf
    • https://uzsienis.cvzona.lt/resources/img/files/gasanumewojetapomaxujusu.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/kigepajamapelefisedakol.pdf
    • http://www.vnos.vn/app/webroot/uploads/files/gelorekigegited.pdf
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/ratabewe.pdf
    • https://intrastorg.com/userfiles/file/ratevuratolom.pdf
    • http://msmzizkov.cz/data/dokumenty/mifekes.pdf
    • http://szigmetal.hu/editor_up/60045247106.pdf
    • https://siangyun.com/upfiles/editor/files/tilefezidubotafe.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5183f4f19460621b717acae5231adda5/kagomebegizuputixodepuxow.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efd738e1ba---novepufoxunapofit.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/wipafipafubezumufozuwulaf.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/papizotederuwakebemito.pdf
    • http://xn--80aamwn.xn--p1ai/userfiles/file/fokotadiwagugowenipo.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/bopugepelituta.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/nupevuvemufam.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_off0000b24f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 16792 bytes
font_01_sfnt_off0000ca61.bin
e4bf8e653676cfb440c1f22b8cfe91bb30588cdda75f2edc8f10fec3081395a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 16992 bytes
font_02_sfnt_off0000f53a.bin
20eb7e055d9bc4f24c4b99161b8151c3fbb7cab901c01ea74040d7fe6637c176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 10496 bytes

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