Malicious PDF — malware analysis report

Static analysis result for SHA-256 0905e0351e4a9a7a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da5c224aa9e47ab255b7bc991688bbc8 SHA-1: b7e19b67b52b1d3207028ab9fc280bfb7df37485 SHA-256: 0905e0351e4a9a7ab239decf0db986eff1afae9e7a38d43a0657027786f31e0a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=a+modern+approach+to+quantum+mechanics+pdf PDF link annotation
    • http://www.kymkarajok.net/tiedostot/files/98386022298.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/vaserotadozame.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/xupuvu.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305389203424.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vepewubodom.pdfIn PDF document text
    • https://solturism.ro/images/file/samazogarid.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/40311800985.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/85343155646.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/sazokag.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/mimena.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/rigajot.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/naxaxojoworiwijisi.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/12915743688.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/96105341237.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/48654114331.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/pagolejifegixatiti.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306e469a74b---gilasubidokonadinajep.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/xujenarapufosoxabiwona.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/gapov.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/boxejopa.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/12030542501.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9f872edc---93113850957.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zukuwomiroseje.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/86696085914.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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 11064 bytes
SHA-256: c44c3360ebc986aa9e40fd18e3bcbe6c4731d717886c559dcc918c95710d2b50
font_02_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 17064 bytes
SHA-256: ae150563da795eb4a649824e575b8059c8b9e609f1a592e07aa91082ee7da10c