Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f5b4cba6290910…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 19:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a5baa988d301da409878db9bbc51fbc4 SHA-1: 807e2e9e477a3e18dfda13c103903d2996d30a13 SHA-256: 37f5b4cba6290910918c930e170566aa5673ec583f0a5e86f892d2ea6fa0b50b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+to+connect+my+phone+to+5ghz+wifi PDF link annotation
    • http://jinruily.com/UploadFile/file/20210907174943883.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/32780059658.pdfIn PDF document text
    • https://atrax.hr/files/32064647282.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/nulopuxufikuketavob.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/52555458583.pdfIn PDF document text
    • https://epiphanych.com/images/file/632070030.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/76315526455.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/45902815283.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad950883c---nevewobijofezetapisab.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec5aef2ed---jakomujamega.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/39700701115.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/74304376641.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/jojubogusivebuf.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/96106249211.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/dunuma.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/nuxunizorawixanugabenu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/70388291509.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/poxesedapuvaxusokedum.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/67378689650.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/jazuvevujimatenoj.pdfIn PDF document text
    • http://zeci.nl/im/image/sofarasib.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/92058101401.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090307050773499.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/mekolakomawekimufosumo.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 17624 bytes
SHA-256: 72fc2c6c4640a5ed4cdd4e32f1567fb4809a65e3ba0cdc5111d1f5a89cc15ddf
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 10836 bytes
SHA-256: 4d680c0a7bd02e6889949579444afa23ca29f0bc519e69e7e6e2ff017447a36b
font_02_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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