Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa75f70615dbb25…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 05:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ce547ef5482048464f9f0c0e073e976 SHA-1: b89ae16216081ebc9127a0468920b10c8bca7712 SHA-256: eaa75f70615dbb258ce570548ddd2c1c4006a7f45fcce2a124b2dedebb43b138
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 are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=apk+top+followers
    • https://sgcaregiver.org/contents/files/rurezakowisaresabuvi.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/92223272548.pdf
    • https://netron.pt/app/webroot/media/files/dilotibofabejugupe.pdf
    • https://carlojans.com/cms/file/22558334080.pdf
    • http://iberia-ex.com/images/blog/file/50748081064.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613562eb058cf---napexupuzage.pdf
    • http://leguido.net/files/73172532013.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/gukuvo.pdf
    • http://gzbaosui.com/uploadfile/files/47313609845.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/41567363300.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/bosiwexujugabubuluxusakoj.pdf
    • http://rowerowaszkola.pl/imgturysta/files/42224272079.pdf
    • http://ros-audit.com/i/up/file/zokoloferixazazazare.pdf
    • http://olech-rzeszow.pl/userfiles/file/19452436205.pdf
    • http://biznesfishki.ru/files/userfiles/files/rasokafokonubalesetik.pdf
    • http://massimomoroni.it/userfiles/files/girurudetuwo.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_off0000cfa6.bin
1074081ee5c9c6fb12dca0cdb538ca1897e3765bf54580dd2901c5a1dc20b6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 10152 bytes
font_01_sfnt_off0000e6a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 16792 bytes
font_02_sfnt_off0000feba.bin
9f12ea24ba8276548f166fb38e884a9f25ef8c6c6983c00f3d3846fe1198b0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 17288 bytes

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