Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc5c840c2242301…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b7f15f69fb07942daf43c938eb30cd8 SHA-1: bb5c6961b62f3aeff06b3565598be659c9fe5d10 SHA-256: 6fc5c840c2242301dd89a6d98faef80db3a63406d5e8394fd97c9a95c26bceff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=galaxy+a7+custom+rom
    • http://kangmeideyiliao.com/uploadfile/file///2021091106365866.pdf
    • http://lideparts.com/userfiles/file/1630742585.pdf
    • https://eol.org.pe/ckfinder/userfiles/files/82312588869.pdf
    • http://saovietgroup.com/upload/FCK/file/wolusurunikarewomigujan.pdf
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94442490838.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikaxazoxepes.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53286778430.pdf
    • http://dragoniresorts.com/userfiles/68155730166.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613756f934c75---piduti.pdf
    • http://aa-nusd.jp/14559583900.pdf
    • https://yaofangpeixun.com/upload/files/zaletewumowavopuvonepod.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/zeguroxazi.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f9a5a639b26791b603ff4fbe98ea80f7/3390031202.pdf
    • http://sieuthibds.net/images/files/81434878802.pdf
    • http://tryinvest.eu/userfiles/files/14665191055.pdf
    • http://arcenevents.nl/site/upload/files/57780774023.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/8437879021.pdf
    • https://mwasafat.com/uploads/files/getewapajap.pdf
    • https://firesystem.ro/imagini_ws/33228662370.pdf
    • http://mjacz.cz/soubory/files/fawepisalexojilopetik.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/47228219617.pdf
    • http://engroupe.ca/aym_image/files/28796658041.pdf
    • http://sichera.eu/userfiles/files/91848185122.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/zexijopema.pdf
    • http://deeringbayrealestate.com/userfiles/files/luwoxakonetetovupo.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_off0000df28.bin
a904b1c72ce3b158b70ea027ce4bd6fa302f8061d944dc07fc6d383db2ff511b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 10468 bytes
font_01_sfnt_off0000f71f.bin
3d71a84016184155d5b08016ad2405a7f3d04014502feaa463923796d3a1c9c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 18728 bytes
font_02_sfnt_off000127c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 16792 bytes

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