Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ee18dbede1d29a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 00:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 983a461a46f991876fef0c1c2231ec2e SHA-1: b697b26de464d93d7af53cb88e7146e23a48d0c1 SHA-256: b2ee18dbede1d29ac41a122061078b64925572f712fdf71b806a283414ebf5f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, reinforcing the idea of SEO manipulation or a distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kamnitikamini.si/upload/files/madevujoxodebu.pdf In PDF document text
    • https://5ky13lu3-1251.com/contents/files/84081266836.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/melaxatirikug.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/rewiwopita.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/sojori.pdfIn PDF document text
    • https://priscar.com/documents/files/vuwipegiranaruweju.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/482b7f55baf376985f33ed916f674358/31569995568.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jogaridumevelefijovekubep.pdfIn PDF document text
    • http://saint-party.com/media/file/46332162557.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/xuvoviduvuneleboxaf.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/fogenodegubesotu.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010310237761.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/kavobokiwaboninabanigezid.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/69821931235.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nazimabedazelubogutit.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/61953507299.pdfIn PDF document text
    • http://hexindechem.com/upload/files/75599641149.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/33536628645.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/57585952506.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/50615230750.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb30400986---xesusugu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/xoxor.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/76033764084.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vupidakafuserumugixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=adb+driver+linuxPDF 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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 18604 bytes
SHA-256: 87d6a3131e2d4508643dad8d9b997767099c46de4daf953e9ce293d4abe967c0
font_02_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10080 bytes
SHA-256: 65aa185b8d385cd7b210409d54437b748e68a93884d47eb2d628db8a64e6705b

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