Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bbf8aa7afe6c1f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 11:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9485b264f6cc8db9cbd3d8d909cc9bd SHA-1: f8b4603651319559e17a87c60800e116c044265b SHA-256: 61bbf8aa7afe6c1f05f946cdccf0814246011b6fbb01eed5eadf271d4c8ca165
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites, likely for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gangnampools.com/contents/files/10799699365.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/ratisugizugasabaxibad.pdf
    • http://prodottoitalia.eu/userfiles/files/tovevaparotusutelega.pdf
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/mojukateza.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/jakuz.pdf
    • http://rideco.hu/upload/file/vumaxorifarojupukavo.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/repaxufituf.pdf
    • http://hytechplus.com/userfiles/file/16792776485.pdf
    • http://dsfly.com/uploads/files/20573106935.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/78482853334.pdf
    • http://smalternatywa.pl/media/upload/files/1d314f6a4e6d096abe9042b9625111de.pdf
    • http://juha.be/_files/file/23329453892.pdf
    • http://infinity-c-t.com/userfiles/file/luvig.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/xipujejanoguduweka.pdf
    • http://ranch.pl/files/file/82744211126.pdf
    • http://grandinhr.eu/images/user/file/zumokanovurujurozezigupif.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/95514064867.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/jipuri.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbf44d235e2d0669562cfd9e31d77dfb/zedib.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/2733042006.pdf
    • http://tiendanatacion.com/noticias/files/83320558575.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64465520689.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf0835f18---gegizugiwotowitota.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gunship+battle+3d+apk
    • 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_off0000b7ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 16792 bytes
font_01_sfnt_off0000d001.bin
dc59e2f1ee5bf6397a7948de7b5480b6d47e97454b8bcef8bbb62b3b50118a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 10812 bytes
font_02_sfnt_off0000e8a9.bin
d60b4d1b013bd1ef0038f4ff44a4324fda3c9e43db50f6217d1143cfdf2f3bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 16236 bytes

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