Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b238e3f6d94f9b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e4f66ceef8744403b946d39af7506c5 SHA-1: 0464f7450fe68682d784b32bf670fcf60caaabc8 SHA-256: d3b238e3f6d94f9b934372372b3ce3037d1dabad7d06ff6f2ca8c552c210891a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links on disposable domains, likely to obscure malicious destinations. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://maymaygiaydachidang.com/upload/files/sefezaxewerotilutaxex.pdf
    • https://sanaspinler.net/calisma2/files/uploads/25813236911.pdf
    • http://jcpingie.be/public/files/gelaxuvunajurarapapotex.pdf
    • https://vildmarksjagt.dk/userfiles/file/37604488508.pdf
    • http://balbu.hu/uploads/news/file/67663186615.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/55877225631.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/basuwewewapubidajonevepug.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/9354136565.pdf
    • http://plkorea77.com/ckupload/files/16535346225.pdf
    • https://zhansq.cn/upload/file/98960350248.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/dadaxivavopuk.pdf
    • http://trubaopt.ru/content/file/97480839909.pdf
    • http://1day2night.com/UserFiles/file/65385186239.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41417a9bd15bb5690ed9c65c2289daaa/99285593652.pdf
    • http://letsfinal.com/userfiles/file/wulibuganeguduxodobolubu.pdf
    • https://betenenergy.com/sites/default/files/file/mijaxuratu.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/90653546033.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/82623091032.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7b4e6f7d---konutet.pdf
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/sesunazolejemotax.pdf
    • http://ls-machinery.com/uploadpic/files/202109080314384430.pdf
    • https://lufty.cz/UserFiles/files/56919135277.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=signature+image+outlook+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_off0000cf5f.bin
3048617e20e6b4374e89f23a373c3a0291d18d239ae77e33863023b4203bcc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 17224 bytes
font_01_sfnt_off0000fbb3.bin
d3ace178b3ae77eff9280b3cb67d709c3c896de0cd606e635cdac134e52e97fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10692 bytes
font_02_sfnt_off000113fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 16792 bytes

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