Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef270e9ca341fec…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 15:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1ff2484f41ce191e911d7c6e745a470 SHA-1: f4b13db71920475de3b1313e26eaf3ac370ea9d4 SHA-256: aef270e9ca341fec6024b8f3db008f77f321d17ee06f7ec6003d997901b7d03b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected 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 link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful content.

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 https://synerhu.ru/uplcv?utm_term=apk+cs+go+mobile
    • http://smcertificationservices.com/userfiles/files/93426601620.pdf
    • http://villalapinetafavignana.it/userfiles/files/89020146683.pdf
    • https://majubesar.org/contents/files/kumigigul.pdf
    • http://caudafotografia.com/userfiles/files/22541197876.pdf
    • http://www.casasemio.com.br/ckfinder/userfiles/files/petunokunata.pdf
    • https://badanie-wody.pl/galeria/file/56768887368.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/wegelarupirisijuninidiw.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/kanek.pdf
    • http://chandravanshi.com/userfiles/file/gajukuzazop.pdf
    • http://belloverde.net/emailer/file/3738107083.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/kogexakuliva.pdf
    • https://foodvellythailand.com/upload/files/misaviwe.pdf
    • http://guerrazzi.info/userfiles/files/27779636903.pdf
    • https://promaxsuspension.com/csmimage/file/16679971797.pdf
    • http://ladna.pl/user_images/file/86087573228.pdf
    • http://precisao.net/files/files/refakar.pdf
    • http://blackhorsesc.pl/userfiles/file/15956432906.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/zudegokerevepalilu.pdf
    • https://vandolderskb.com/images/usr/49503872403.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fecc1ab9---1036114265.pdf
    • https://gregoryshow.ru/files/file/tiligebenazaxepufifij.pdf
    • https://mrdak.cc/uploadfile/files/85627923122.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb207df43---32654231920.pdf
    • https://hotararicedo.ro/files/files/ladoxenanaxabemowofoseto.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_off0000c3eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 16792 bytes
font_01_sfnt_off0000dbfd.bin
d7640e32bf8507460820126cefc62667dbb25f33d2deaab9d37b47f946ff3156		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 20100 bytes
font_02_sfnt_off00011146.bin
49516041c8865b9d1217d768989595ad0da6d2f8e8a65ccb0884f59e42549374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 10468 bytes

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