Malicious PDF — malware analysis report

Static analysis result for SHA-256 073c825c724399f9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 19:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 236d5a0a1b7512f5a1a4a2df970884bf SHA-1: 801eb30aaa8ea1ba18e4f8295c1fa0dbc39d257c SHA-256: 073c825c724399f99a503d6325f9c8880a2731f605cc424982a195bab5eb0fb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to potentially malicious domains and an IP address. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous small PDFs on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://smidgel.ru/uplcv?utm_term=emojis+ios+android
    • http://adaviestransportltd.com/userfiles/file/24325525690.pdf
    • https://alzubidi.com/userfiles/files/98451022314.pdf
    • http://favorit.pl/userfiles/file/tajag.pdf
    • http://opusincertum.it/userfiles/files/padijazepixorefomi.pdf
    • http://studiotecnicodama.it/userfiles/files/71886972728.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/nimudipesaridewewipiz.pdf
    • http://geofer.eu/userfiles/files/72248430013.pdf
    • http://157.230.241.115/image/upload/File/99153059122.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/dibinedaderuj.pdf
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/22216687629.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/15888082539.pdf
    • http://elma-itc.ru/!upload/files/xetenawodun.pdf
    • https://reha.bg/content/upload/file/1054903710.pdf
    • http://serextion2006.com/js/upload/files/vafuvubusovovajumujaverir.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/14621647301.pdf
    • http://goforthegreengolfpools.com/userfiles/file/lujutitomega.pdf
    • http://haenuri.net/ckupload/files/lofokabeva.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/pisoxofiwurobus.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc6522630---xisitiminorasuxulirulowuk.pdf
    • http://condosworld.com/abisol1/userfiles/files/7766388563.pdf
    • http://186086.com/upload/files/12562165253.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/03216ced141f66bbb8d32cd7d02f6e9a/13170450273.pdf
    • http://megalabsrl.it/userfiles/files/46108152175.pdf
    • http://camonetinternational.com/files/file/rufoxufo.pdf
    • http://stin-verdon.fr/assets/Image/files/xodomaronixijojabugagop.pdf
    • http://ros.by/ckfinder/userfiles/files/pomodasi.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_off0000c405.bin
48ca94cc35aa3709e3bd03760681d64a15b35dfa27fec7f1ed87639c9b1e2e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 20528 bytes
font_01_sfnt_off0000f97d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
font_02_sfnt_off00011194.bin
1531db18c7bd3de0027de3ea0fa9885fec8a75323c14de0eedf855babc2f361b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 10248 bytes