Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f499ce03b1170f7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 16:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5d7f814c229ac9e43637947e4be455c9 SHA-1: a0b887e186b03cbae2a8d33c26d7bd171e8f4eba SHA-256: 6f499ce03b1170f7932cf8c3c738e36ed64c6096cf60a963f2ed082661c36e31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=hardware+reset+android PDF link annotation
    • https://makiriaszto.hu/ckfinder/userfiles/files/69044860669.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/dobuderinodetosudisawef.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/39397557912.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/pebetitevitaxok.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixipuwulidusiwawa.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901174640.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/49973802868.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/68403824133.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/4338976824.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36330401846.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/31447776061.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210905131239.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/11053376442.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/6965274940.pdfIn PDF document text
    • http://flyags.com/editorResources/file///21951498617.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/deguzupibobulima.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/18669256716.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/34695868428.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/parajopipizasazuxa.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/54137833725.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/46391195841.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/lemokuzevozefajugepawe.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/51722657908.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 10272 bytes
SHA-256: 90aaf9b3c2a5f35c269ef1be20e5ef9fb061d14ca7e456e81a34f6339df765ec
font_01_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 18068 bytes
SHA-256: 757440523df8a308ed825a456e0730fa52ff903e040c00affd6d707af8d0c9d5
font_02_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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