Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3031deb6850b5a9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 16:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f9922649bb9d0c066316dd78d77add5 SHA-1: 0049c9200fb82049122a22db8a1bd45cf3bab160 SHA-256: b3031deb6850b5a9b187ded0403b41815a6230cb6bc6c8521d604dac47474810
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malicious redirection scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=ejemplos+de+proyecto+de+vida+de+un+estudiante+pdf
    • https://getracemirates.com/userfiles/files/gugesuwizekinukilu.pdf
    • http://kommunikator.nu/demo/userfiles/file///27981064029.pdf
    • http://evolutionchonburi.com/userfiles/files/30981040509.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pehhls276mm62ndrdql8mgmms7/19503505752.pdf
    • http://newabel.com/ckfinder/userfiles/files/25318088983.pdf
    • https://ptkas.com/kingkong/userfiles/files/kibafujudus.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7427220fc076f301f6ad101e590d5eec/xajavifagu.pdf
    • https://raovat72.vn/uploads/news_file/roruge.pdf
    • http://goldmustang.ru/files/files/44355111028.pdf
    • http://internationalnetworksolutions.net/files/
    • http://dalnoboy.org/data/filestorage/upload/files/47808223181.pdf
    • http://tunglamgarden.com/images/fck/file/gitoge.pdf
    • https://pellevah.com/upload/files/84240019011.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/mupogar.pdf
    • http://moestuinwebshop.nl/userfiles/file/wuxirosagavekevawotafug.pdf
    • http://bloemenwinkelindex.nl/images/uploads/95420480417.pdf
    • https://bnbcostaverde.it/userfiles/file/30400643454.pdf
    • https://weborder.cloud/userfiles/file///23641418717.pdf
    • http://villapellegrino.it/userfiles/files/nuzariritula.pdf
    • https://nepalihemp.com/ckfinder/userfiles/files/70690142508.pdf
    • http://monamifrance.com/FileData/ckfinder/files/20210904_B36B40351240E7EC.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161363bdee3142---rurex.pdf
    • http://osayit.com/images/file/pezolozatebami.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_off0000e134.bin
2f2496e0616597ef91de27899c4be86d17645ae84f65ff2cfb58c398515f4e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 11172 bytes
font_01_sfnt_off0000fb50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
font_02_sfnt_off00011362.bin
62d9750884516fc205e109a1f80a15dc82948fac7ffd82401752b540ecb5cb21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 17412 bytes

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