Malicious PDF — malware analysis report

Static analysis result for SHA-256 7512f0ca8da3792a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 17:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cca4c64138492834019e20194761ee58 SHA-1: e68caba3904306b3aa060adee104b2aba649abc2 SHA-256: 7512f0ca8da3792a86cc6033b56c6b9452a93b3c3e5e0dcb8e4365f9b210d712
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 to malicious sites. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://ubk-sad.de/azubi/userfiles/files/widijikiwigepu.pdf
    • http://icmasistemas.com/userfiles/files/78997214665.pdf
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jowavat.pdf
    • http://babyshelter.net/assets/upload/files/99891664105.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/koruregedizofuf.pdf
    • http://baloneacessorios.com/_upload/file///lobodulikesi.pdf
    • http://bojovesporty.cz/userfiles/file/jametuverizel.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/30758888380.pdf
    • http://sunrui-ti.com/d/files/jamoposijegatu.pdf
    • http://newgoodluckcrane.com/admin/uploadfiles/file/45022616259.pdf
    • http://kammed.com/userfiles/file/jejovolomibifepukadeta.pdf
    • https://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdf
    • http://lexxyin.net/files/fckeditor/file/86654242321.pdf
    • http://botosani.ro/img/uploads/file/52113445495.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fv6iiohjvjivrce41vkejlcr52/55382154184.pdf
    • https://mimpiindahsatu.com/contents/files/jasapa.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/58553259689.pdf
    • https://cevhertemizlik.com/userfiles/files/zozanuxeditokorexadoviduv.pdf
    • https://szabobuszrendeles.hu/files/files/60589784596.pdf
    • http://wsp.pl/userfiles/file/todasazojovokugulisis.pdf
    • http://playbabydoll.com/userfiles/file/sulonuladivimemewalejula.pdf
    • https://saatyapi.com/upload/ckfinder/files/53531846600.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=samurai+shodown+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_off0000bae5.bin
cd7e8426b0230355b7d1bcc4b54a24fdad51cf99e7c894ea8d528eacc78848bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE5 18252 bytes
font_01_sfnt_off0000ea78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
font_02_sfnt_off0001028f.bin
ac49924c53be7a74dcc32e630773dc7d96aa0b26ddfb41b3becfa7cecf3ac792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 10736 bytes

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