Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb114eb6b417a787…

MALICIOUS

PDF

75.1 KB Created: 2021-09-25 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d7062698cec0253a663306d08f44def SHA-1: 695d75317520f4a642efe856ab5b825a9cebb0b1 SHA-256: eb114eb6b417a787ee60a47f46a8886c008ed8b1fa89b481b604b3700641d231
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external URIs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or redirection scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://archism.ru/uplcv?utm_term=pokemon+amazing+cortana+gba+download PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef8db72efe---nejewekijakogatalopejive.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/noxinugizezabulumuw.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/50734172131.pdfIn PDF document text
    • http://archive-2013.humandoc.pl/attachments/file/sepobagonufasewugasawobiv.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/76335352097.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/demuzedunat.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/paluwawi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xosaxolexebedovowaxexeka.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/15297287281.pdfIn PDF document text
    • https://csodamalom.hu/files/files/jomakozotis.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/jowowemagajife.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/36104488947.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/18298008997.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210914172244.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c48271e0868ac3cc1b89f9fcb5f97033/32532931410.pdfIn PDF document text
    • http://186086.com/upload/files/doxel.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/motogab.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/80281119588.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/lesixeramogomi.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/noralogajodalusabuwofo.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/81013007533.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/rogafulibolufuk.pdfIn PDF document text
    • 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 10924 bytes
SHA-256: 598fff6d42078c41ae560011ff82faf02821f6100825b46f516e0058fc4e4d3f
font_02_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 20264 bytes
SHA-256: 60dd5c00834c163f9af5e6974c80592c4ff637d372c54bffc66e52be743dae4b

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