Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9db22b054caf1f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-14 02:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fba5f360664c730cf8f6312f184f67d SHA-1: 90deb4a78e2f9027989756a63f8ae5761a80b549 SHA-256: 2b9db22b054caf1fc5231c86086483763c921e644fb5606ffd8598afe317e13b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a download link for a game. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=download+biohazard+4+mobile+edition+apk PDF link annotation
    • http://aquamedia.cn/ckfinder/userfiles/files/20329358207.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/dijixewixugeje.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/93381290644.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wemetinebivukepokajuve.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/voxisutovopedimigalewisef.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/tesemabezufi.pdfIn PDF document text
    • http://abwrva.com/uploads/files/88886570832.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/884cea.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/sawapixixijimi.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/nidavesifitonovan.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/18260609827.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/tulunoxojogaxutila.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/49629216255.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/nuxixarumesupuda.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/47468567512.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73ca68d5---10003391683.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/rivuxarewebutirut.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/vinefarofa.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/23415321604.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/texuzimivaz.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/xulumefoxazawibeg.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210912104511.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kosevigob.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/97325215652.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_off0000b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB271 10948 bytes
SHA-256: 37c36c2e3161fb0a70756d8258aab307fe328d1f8e826fa575457c9c8a5363ad
font_01_sfnt_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 14548 bytes
SHA-256: f919b772f7d06728b221c1369dab05dda8cb18d8fa083e0fbf988db6e7d6af1e
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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