Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1d9d26863db56b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 02:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5a4dcb8bb101f29fc70562aa5976a79 SHA-1: 9cc11efec5f3a9b1d73a6ec25aa9b06bf36f9520 SHA-256: 0c1d9d26863db56b331bfc5c05f1fe5929dc2cd73e56829a60b61087bfcadd2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to redirect the user to a malicious URL, as suggested by the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which points to a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vinaaquachem.com/uploads/files/xebobaxogu.pdf
    • http://ekorepetycje.eu/Upload/file/65415077116.pdf
    • http://hightopeducation.com/cms_uploaded/file/memizisufokunedukewelug.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109131618323175.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/pebunito.pdf
    • https://thaiahpa.com/flash/files/71634721077.pdf
    • http://licausi.it/userfiles/files/faxepupute.pdf
    • https://lixtech.com.tw/ckfinder/ckfiles/files/3861115929.pdf
    • http://mail-ex.net/userfiles/file/pasemumubaxegatezeto.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/80464422458.pdf
    • http://poltinka.ru/userfiles/file/49477324406.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613639f876785---41973515489.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58048970554.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/82427410903.pdf
    • https://martensmgt.com/business_school/uploads/file/73521323271.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/difonunofosewaluge.pdf
    • http://midospa.com/upload/files/mowazinapuran.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/5833142971.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/20393327666.pdf
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/45186637367.pdf
    • http://beveragesgs.com/userfiles/file/78006263076.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/43743395617.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021981447137802.pdf
    • http://fotocaroli.it/userfiles/files/kakodusunol.pdf
    • http://esoftland.com/userfiles/file/90997900884.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=extend+display+to+android+tablet
    • 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_off0000dfef.bin
6d28a8ad3c83ffe7cd668fe36309c3adefaf3adcaba83a67a4922a5a4a547fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 17784 bytes
font_01_sfnt_off00010d65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 16792 bytes
font_02_sfnt_off0001257c.bin
f375ef263381648e36ea7b89038b59884264f6bb914331809d918d062a4c8052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10724 bytes

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