Malicious PDF — malware analysis report

Static analysis result for SHA-256 716b9a105aa88540…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 06:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5907994cfc0408e83ece6665c8ad518f SHA-1: 2a77b312fbd24ee3d86dbc6f6c8b0aa7609a2df1 SHA-256: 716b9a105aa885408a47c58cfe1cb356a214e552ac860a4553e4191ec04d5406
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a ClamAV detection and an ML classifier. It contains numerous embedded URLs that likely serve as redirects to phishing sites or malware download locations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=group+text+android+and+iphone PDF link annotation
    • http://abwlargo.com/uploads/files/lejasexerimexabaza.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/fazuxaw.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/fejexolenipotare.pdfIn PDF document text
    • https://12shio3.com/contents/files/wobuvenefewososubax.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/4434474256.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/20951594172.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/63965987182.pdfIn PDF document text
    • https://kimcert.org/E/file/jamabumabawufexutiwe.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/5303854650.pdfIn PDF document text
    • http://rilta.net/userfiles/files/litixobinafupufafug.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/1924048565.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/26816401918.pdfIn PDF document text
    • https://wasael.com/userfiles/file/zubaginemuro.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/nenome.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/56180245811.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfc963e12---83753039117.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/tisitutakavirudaravowiz.pdfIn PDF document text
    • http://poorclarescork.ie/images/dawazave.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b7db96b279014f47c48ee9f4164657c2/12488336631.pdfIn PDF document text
    • https://geloracinta.com/contents/files/kedagabojogekogubopa.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zulenigezevejuwan.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/72433123288.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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 17424 bytes
SHA-256: ec97a3935572faa886270ab301085168b58e56884b234d2278b67153a346ce3f
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10516 bytes
SHA-256: 4cd77e2a3ea836cb929b1971fd3177eab05462ef6db8aab98e1c49213a2eef3b
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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