Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7de88d1b7989b17…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 06:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e611c2cecf6e48af745aad3e2684203f SHA-1: 12ec69adf3d8bc2c1ef87bb7ed8344953678e516 SHA-256: d7de88d1b7989b17e20e8d9a816702b48150af0d2137c67d5efa2deaf936bcf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicating a high density of links on potentially disposable hosting. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://stehovani-ostrava.cz/static_pages_files/file/66330232492.pdf In PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011625267080.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bixukiwikevanadimakasu.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/zisofinizivedevu.pdfIn PDF document text
    • http://www.og2c.com/images/file/81164370200.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/59980399433.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/rilezetawudunigegasared.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/jabefexovokijejibebukim.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/50736189561.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612f081cf153b---ramirawekosugonegujuxa.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kesakerab.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/86094007443.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/dokafi.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_4E70C3E22274B2EA.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/1077159631.pdfIn PDF document text
    • http://jainfarms.com/uploads/tezeg.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/31055748246.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090608574055.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/65603892099.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/ranotebuniz.pdfIn PDF document text
    • https://bselink.com/userfiles/file/toxixoj.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sakegidajuworamopoguxid.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0d080dd2---30914471830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dvd+shrink+3.2+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 18800 bytes
SHA-256: 766b2de041dade8557dba47a75194a741125e7903d87cc510035ebfc441d6a6b
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 10720 bytes
SHA-256: d4c9d13b3c8a03c3759086b0e1a579a004980df8fb424fbb91fc69ecad2ff6f2

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