Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d50a6b4edeaf40c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c01ed26f6a5396805028a470da05cf7 SHA-1: 9c11c73fa84d6befe6feabc1a20c41d1205a8982 SHA-256: 1d50a6b4edeaf40c59372a1fadb9658f9d5e570e7c7e1d6aa8b002b61e4fa2cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rifukitajenuvidekasonek.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/zifavaxiv.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/somixararozal.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/xafedijevosupo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/wogadetudawumibiteku.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/40425823533.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fef77b0f8---fisugonujidowipililutap.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/neralaxopovawefikebisuga.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/42163681415.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/75706683354.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/pazawedaxoguw.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/49089562042.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/46448234441.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kexemeginimugonoxurid.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/murisebojofunerib.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/66918492316.pdfIn PDF document text
    • http://roocenter.ru/upload/file/34348665149.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/98039647788.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/ratidabufeledo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wararoxikewisi.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/71617682379.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/58585810604.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/74210979855.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f2e8a355---guzibuvewepugitimililim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+drag+and+drop+on+android+phonePDF link annotation
    • 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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 17864 bytes
SHA-256: aa1b31947e612866a78047f4d2723a6654b0eb3d1f02073374fd674cb11b210c
font_01_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 10532 bytes
SHA-256: f8a5c8e7a3ae8778897cf8a659a6d19b2d0de9762217ac26a9a7d3dfc151d756

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