Malicious PDF — malware analysis report

Static analysis result for SHA-256 93593828fa7db900…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 04:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6383310d781281f74efeae30544d188 SHA-1: 7cbf9c375d691c0a6ef9cfeb3d02ea523f5699d1 SHA-256: 93593828fa7db900aed8a94ab49d62ddc45caf18f123e3eb1c0ca66ebb1926ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ottuk-e.org/userData/board/file/sozotijuvazugoropobukot.pdf In PDF document text
    • http://kompassztuki.pl/Image/files/xosadivuw.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/63715439295.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/031823377028.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135304bb252d---zovesixe.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/48875449891.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/34645753400.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/ramoxoxakopifom.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/nobezidafotovixevog.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/gibujenarodanuxibufowemix.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/vorojajato.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/99318489115.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/374579524.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/domeku.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109070037183690.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/15880304557.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/tuvefunixavetikofaw.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6d85b0846---vuvekakegukada.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/88659010061.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/86009363767.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/71336092784.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/44969481961.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/sedotediwonoloxik.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/sejanomoline.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hd+sports+live+footballPDF 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_off0000b2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 10584 bytes
SHA-256: a1f2012bc723ed3622a7a471ef09d41be0804214d5b5c1b734e116dd3279dc89
font_02_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 15452 bytes
SHA-256: 3f7dc1d1331ec731dfd93ed8c2a4177744f8e281450d2e61d734a46bad06f7d7

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