Malicious PDF — malware analysis report

Static analysis result for SHA-256 2133f5d4cd358602…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 01:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c04c6fc084af4f2272376b797251e41 SHA-1: f06d88107366f45c7260133ce39e46b88b350ddd SHA-256: 2133f5d4cd3586023b515817d47be54b4ab0c3d23d05dfe3771f10b9e79a3cfc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable or suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on potentially malicious hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/lomako.pdf In PDF document text
    • http://goldnumber.info/userfiles/file/901114946.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/danimutebeligar.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/98127348722.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/53019061708.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf7191a4f---61057384042.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/62555081878.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/vovuzogiruvovirirewos.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/kawewizas.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/49753513991.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b65a8651---69994333430.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/67185526993.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/19340596570.pdfIn PDF document text
    • https://tekmaker.com/upload/files/jepojudupokinosemimobi.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/kelalajavu.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/sikowomokininekirulixoxu.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/43631603632.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/wajudat.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/xumidusidunugapolufopodag.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/18908885027.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/44495449920.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/xuwugesavowajovexitakel.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/towerosositogitegurizesad.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lutukeridanotige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=read+instant+messages+permissionPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 17372 bytes
SHA-256: 844c7bbbe68100665a93c9ad909c1651719bf400d529760b77e93e478eae6c0f
font_01_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 10732 bytes
SHA-256: 0a443b31d979fd9826fe339a08cf2e2358ae2164388a2108cf1467a0867b0bd1
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1