Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea21477a08dbf31…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 03:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4acb0e43c3c5c677b3623aeb5fcb67b SHA-1: 6338908e9c0f0079ab72f8b898cb3ef22f306e0e SHA-256: dea21477a08dbf318b6b9a1d1034278eea994242cb1e08ec349e136ff1a8aa2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a redirector for a 'gta online free download' lure, suggesting a phishing or scam campaign. The PDF structure and embedded links point towards an attempt to direct users to potentially harmful content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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=gta+online+free+download+for+laptop
    • https://briljant-maleri.se/UserFiles/files/wunuvokewebosejelukazo.pdf
    • http://sudeoksa.org/userfiles/file/20210911175032.pdf
    • http://sten.kr/club/data/userfiles/file/20210909070204.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/20808502483.pdf
    • http://ficfart.org/userfiles/file/21292546666.pdf
    • http://huichem.com/ckfinder/userfiles/files/zotixavaveloxodewesepe.pdf
    • http://teewer.mn/ckfinder/userfiles/files/tipefike.pdf
    • http://cloverdiamond.com/file/wuxuzavo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/76900a1873d1a980e1a071db3e1fef71/tijekizesivosipoxej.pdf
    • http://dlzj.net/upload/files/20210901165902944105.pdf
    • http://nacyc.jp/Upload/file/wotexeva.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/30664058664.pdf
    • http://baloneacessorios.com/_upload/file///mazomirujasarilezu.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mabafazapalaliwoluxola.pdf
    • https://n-tlg.com/files/file/46031919820.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/98482366841.pdf
    • http://kiajihlava.cz/UserFiles/File/riwewurimufo.pdf
    • https://es21sys.com/userfiles/file/buxoxowevigewaralexim.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/tepusaxud.pdf
    • http://baaningdoi.com/file_media/file_image/file/kuwunaxamodi.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/wabogazabubogoso.pdf
    • http://deaprogettazioni.it/userfiles/files/86964488226.pdf
    • http://verynailscm.com/user_img/file/34128487232.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_off0000b317.bin
00932394bfa0f3bc11a1f4a6f99d0c6c1be29941e975626556405194bccdb088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 14332 bytes
font_01_sfnt_off0000d6c7.bin
36338bbd63c7eb53388cd809f0399709966a05f54b67440a30d67e822c66d71d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 10448 bytes
font_02_sfnt_off0000eeac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16792 bytes

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