Malicious PDF — malware analysis report

Static analysis result for SHA-256 9794dcfedde4fddc…

MALICIOUS

PDF

70.5 KB Created: 2021-10-05 16:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c401bc3ca2be77bdf23055cba746116c SHA-1: 8692b6ae152abae00d1b0f8c253c1618264b07ab SHA-256: 9794dcfedde4fddc1b89f43b2d664e3a755bb0edb70eb966af7b437da443fdd8
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 facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=short+thinking+of+you+messages PDF link annotation
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/96178349666.pdfIn PDF document text
    • http://tano-cable.com/d/files/84185148876.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/6167589814.pdfIn PDF document text
    • http://telecycling.org/files/file/40636846362.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/puperupuzirekebelowi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/76856585715.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17965796481.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152505b50345---53980900507.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/momixamalixavumo.pdfIn PDF document text
    • https://www.confirmedtour.com/files/vixogugabitizaxaroxe.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/96068221442.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210910134931.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/65157708099.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/lulisudemobezax.pdfIn PDF document text
    • http://snft.ro/media/file/takeneraluwubadamanutu.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/291250073922.pdfIn PDF document text
    • http://juicy-group.com/editor_upload_image/file/68081287663.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/rixufakolidogatokux.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/18182749335.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/viwekudas.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/11977259580.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/fawodesizus.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/10969432074.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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 10996 bytes
SHA-256: cc178b4464fb5ff48ac32aee590a693335b151f6b00b428dd197d0f60723c7f3
font_01_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 15460 bytes
SHA-256: ecf433e76e8f28c1800b2e77bde78b1b65de2f64db5bbf237db891f95b6fd4ea

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