Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc37c1b6ec2b368…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 03:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a9e125d0766e5ef0ee436a64c46ad69 SHA-1: 7cd0f569963983d1298aee8e45037363eb113675 SHA-256: 8dc37c1b6ec2b368d323e1b4b1eb753602a1ccaf46d9a56b26665e43529d368f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://catamma.ru/uplcv?utm_term=top+20+highest+gdp+countries
    • https://xn--interpeas-r6a.es/upload/files/kopilix.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/93566896699.pdf
    • http://fmmvn.net/userfiles/files/48907175233.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/dezujatisubeberudatewar.pdf
    • http://sspvjd.com/FileData/ckfinder/files/20210908_90E86FB932A76804.pdf
    • http://hanyuchina.com/upload/files/36632220027.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/rowoz.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/13239045792.pdf
    • http://namjapizza.com/app/webroot/files/25148141788.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/gazuzopirixofavuwipanu.pdf
    • http://dainichiji.com/upload_ckr/files/worovexamaxuvipevilagar.pdf
    • https://dienmayminhchau.vn/uploads/news_file/sazoraliragoleperulu.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4qqtnt9s6ajdlu6nmuqrg89p12/32324777101.pdf
    • http://xaydungphongphu.com/uploads/files/17043995525.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614299430855c---gufumatokujukunuwe.pdf
    • http://diversecityuk.com/userfiles/file/56483587932.pdf
    • https://worldmedglobal.com/userfiles/files/dexax.pdf
    • http://nkmate.com/FileData/ckfinder/files/20210916_F264D53384A6DC65.pdf
    • http://arsvet.ru/img/upload/betikujawixugaxom.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/pimusikapub.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/guvogagig.pdf
    • http://dotacjedlaoze.pl/userfiles/file/86966121527.pdf
    • http://cwesp.biz/upload/file/bofitulagosapepulo.pdf
    • https://acrgruppe.de/userfiles/file/guborafuro.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sokilenen.pdf
    • http://dlzhrjd.com/images/uploadfile/files/dekopabikoxiti.pdf
    • 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_off0000b28f.bin
890e9df65356caff953d811f795d5746f0cbed81e23b83dea16d3719068be078		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB28F 10892 bytes
font_01_sfnt_off0000cb91.bin
cd02907e1beb7317f30bb111e47f04ec2930501fe3ceba3363b557740c398cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 15780 bytes
font_02_sfnt_off0000f36f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.