Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b303f4e3554d257…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 09:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07884b95dc76a8db2d327f7cfc37cfc1 SHA-1: b0a37cc358fa8b5e78b36c3a1717b8f9b2cacf52 SHA-256: 8b303f4e3554d25713d1fabf84a68910b73f1973b0c7ce0de8c7fe2b2c0d948d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/jupifowulevazibidupavun.pdf
    • http://nagymester.com/userfiles/file/lokozawemizamomotaniku.pdf
    • http://autolubitel-irk.ru/userfiles/file/zopepilevolariritumo.pdf
    • http://h-st.nl/bestanden/files/vupusewesipozedidezekexer.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1710a1d072aafbba65171fde8c54d173/dixurop.pdf
    • http://creative-format.com/upload/editor/files/gagefofag.pdf
    • http://ortopediaszombathely.hu/editor_up/233347329.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/96341463710.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/7121562725.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/40d68d707fbfde57ac306a8038ad0cdc/ruwaruxoxizatafafa.pdf
    • https://nabijdefossa.nl/upload/files/70972234155.pdf
    • http://sin-hua.org/userfiles/rufesujabawa.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/faruloweva.pdf
    • http://thaisomboonautopart.com/userfiles/files/41926011310.pdf
    • http://koreaseowon.com/ckupload/files/20915263492.pdf
    • https://techlan.pl/files/file/50244180216.pdf
    • http://swaptoys.org/ckeditor/uploads/files/97055262679.pdf
    • http://kxqcgs.com/filespath/files/20210901222811.pdf
    • http://martonaroniskola.net/userfiles/file/2500749341.pdf
    • https://rm-parketi.si/uploads/kejebeluv.pdf
    • http://pobierzplik.pl/uploads/files/81319187845.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/benibopoto.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/12904150186.pdf
    • https://kultmotor.hu/images/files/supodilato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=legion+2010+full+movie+english
    • 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_off0000d561.bin
aa4795153ac2715385b17ca9c766946ac14452ee8cd5e85016268d143c424b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 18516 bytes
font_01_sfnt_off00010593.bin
d4019ca18df7031cb487fd3213290c7b4e921004c443bee2c27172f03fc67afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10720 bytes
font_02_sfnt_off00011e17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 16792 bytes

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