Malicious PDF — malware analysis report

Static analysis result for SHA-256 25527d215b9a6c45…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 06:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 825a968fe4c82f9c7190e6e0465a9486 SHA-1: a33ecb5198a2cd6d3eb31c6569896abf07f9a1bf SHA-256: 25527d215b9a6c45141b9469916ce7da9ac65d4f5767dbd637a947c7cda25686
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hydrem.ru/images/file/71714335552.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/44646761519.pdf
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/gurawipuviribuweluz.pdf
    • http://to-kajihan.net/js/upload/files/42413941612.pdf
    • http://evevoyance.fr/adh/.-/file/67860008752.pdf
    • http://newbiesites.com/userfiles/file/10016108070.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/xuxopitenakejijipe.pdf
    • http://studioindelicato.com/userfiles/files/labaxaxidoduzizevagusu.pdf
    • http://zjleiou.com/images/upload/File/33317244373.pdf
    • https://searchlink.org/userfiles/file/12089828967.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/pamugof.pdf
    • http://eros-arena.com/eros/userfiles/file/fekejokegipolisox.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/viwozoz.pdf
    • http://kayapalinakliyat.com/file/55286159125.pdf
    • https://pabxlg.com/userfiles/file/banukifemezijufaj.pdf
    • http://azstorestudio.com/uploads/files/jovifejurozotagul.pdf
    • https://majubesar.info/contents/files/zubolipizuk.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/tisozurudaguxiri.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61f0eb974---jejezotizewijibuxamumaxav.pdf
    • http://llux.vn/uploads/files/54240198438.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c21f67e64.pdf
    • https://leganordavigliana.it/uploads/file/8084946837.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=appvalley+ios+and+android
    • 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_off0000dd15.bin
de1989d68cf72cf23b9b140791d29cab69848530bade0108cc72e4a3a165285c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 10448 bytes
font_01_sfnt_off0000f4ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 16792 bytes
font_02_sfnt_off00010cfc.bin
617a602b54988637acec4ee9c164aa5e2c8e12a7f4af36f60270dc52b3260e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 18088 bytes

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