Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dbadde32829bc5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 20:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9424e3c972a732fef2708d03a0cd6d52 SHA-1: 3a13e5fa9d4f95e67da7bf064ace0697472c1d4c SHA-256: c2dbadde32829bc597f02de71a3275cddab9df970601711ebe4c8ad8d0101ee2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://irlanc.ru/uplcv?utm_term=thinking+fast+and+slow+book+pdf+download
    • https://medicentrumnz.eu/medicentrum/files/file/roxolovokixurinawov.pdf
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tiboripetifix.pdf
    • http://altiro.nl/home/tjerk/file/4109994225.pdf
    • https://heuresromantiques.com/upload/files/dekaxaminitoreje.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/sepefukejosopafakenuxila.pdf
    • http://openendrep.com/userfiles/files/35315543538.pdf
    • https://keongracun.org/contents/files/21582222726.pdf
    • https://gancza-yacht.pl/userfiles/file/64181906158.pdf
    • http://373113.linker.tw/files/dajuxarisefelijonexe.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/virijolukasemodime.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/zarifo.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/22350060875.pdf
    • https://floridainvestment.cz/files/file/21427916547.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/93165052818.pdf
    • https://sapsda.org/SapmaUserfiles/file/faladolaz.pdf
    • https://bakwanudang.com/contents/files/jawisujadilib.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/72693754724.pdf
    • http://balone.net/_upload/file///65950912778.pdf
    • http://labotinnghia.com/img/files/727004104.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417cbe32bf7---96004302211.pdf
    • http://kopdesign.nl/userfiles/file/6899968853.pdf
    • http://rentaruedas.com/files/others/motasonepujizivitam.pdf
    • http://samuiluxurytravel.com/Uploads/file/wobekalezejigeposasin.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0b0fa1a176808c14ec58a5b7ffccbdba/ranafaritibexatu.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/gokelimepizinugunuluzuw.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/68563891869.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_off0000b83b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB83B 16792 bytes
font_01_sfnt_off0000d04d.bin
79661814b219d202d3e41bcd1b9bb658378f3e1bd766ff87d8d2ccc5110fd6f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16860 bytes
font_02_sfnt_off0000fb89.bin
28d10e6d7fbebf758c54612df3ad6f6db2715728d7666431097653453cfa5b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 10828 bytes

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