Malicious PDF — malware analysis report

Static analysis result for SHA-256 b643e9880dd1bb09…

MALICIOUS

PDF

90.1 KB Created: 2021-09-18 14:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dba83bfb149d5431874c053074a49b92 SHA-1: e2b28eea890f9bff2faee43235fc5810f851dea3 SHA-256: b643e9880dd1bb09afbfac1dbaa243b424079cbaf481d10cf1d0485157092c89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, characteristic of a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the structure and numerous external links suggest a potential for further malicious activity, possibly involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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.
  • 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://marcus-1.com/FileData/ckfinder/files/20210913_7D3AEBBA7913F8E0.pdf
    • https://kapefashion.com/files/files/12927368699.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/30388142853.pdf
    • http://auxerretv.com/content/public/file/55929347090.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/zesujorubavokenugi.pdf
    • http://crystal-lamp.ru/uploads/files/gefuwumofuri.pdf
    • http://hulstcustoms.ru/uploads/files/tujugesujatavawetikodako.pdf
    • http://headrepublic.pl/images/files/39599109943.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/15735030901.pdf
    • https://tapuionoticias.com/ckfinder/files/78305526310.pdf
    • http://e-hematologica.com/users/file/68685892233.pdf
    • https://gelblighting.com/userfiles/files/wasuxewuruditomuwakusi.pdf
    • http://boldogelet.hu/media/volaxufejowila.pdf
    • http://boldogelet.hu/media/42534798888.pdf
    • https://monyetjoget.com/contents/files/46138798888.pdf
    • https://zhavezbozi.cz/data/file/36037524357.pdf
    • https://topconta.ro/userfiles/file/jubowowebepikerusud.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109121812326138.pdf
    • http://statsale.com/data/upload/ck/files/51209827872.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eh20frnuodrpqb14bfvk1snbc0/jisafif.pdf
    • http://safarang.com/basefile/files/11157614312.pdf
    • http://k2plusinterior.com/userfiles/24229729131.pdf
    • https://stl-log.com/htdocs/cljr/data/files/lilam.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96c5bb393---tazev.pdf
    • http://101balkon.ru/upload/files/29072645031.pdf
    • https://nezrenpin.com/calisma2/files/uploads/90439455217.pdf
    • http://schokofontaenen.de/idata/54187420424.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=no+night+is+too+long+full+movie+watch+online+free
    • 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_off0000fb52.bin
80760bf98471b93c4f1f97654a0f1426277f4e2bd97bb713eaa23f4b488ec27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 11012 bytes
font_01_sfnt_off000114d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 16792 bytes
font_02_sfnt_off00012cea.bin
049df1d218b6455f88a1609a243118ba8ac6cb55596fffe9bb8c0dc70f87b6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 17628 bytes

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