Malicious PDF — malware analysis report

Static analysis result for SHA-256 725a985069adb184…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 13:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e37cddde0dfad51b4f27f9dfb9fbabfb SHA-1: fa0ba016e5e7e590c09ec989030a05fc663a7721 SHA-256: 725a985069adb184c4177f9a1569dce69a2a029ea7929ce8134b7d723f4930db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://anthonygillant.com/userfiles/file/farufibifunuzesuvugi.pdf In PDF document text
    • http://top-caster.com/userfiles/file/beperurajevinodawuzuxone.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/41275577323.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/rerajedokuragoxamomaw.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b830b4f3---65493144190.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/putexoru.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/jiver.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/xafugutuxa.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/madusatiwafatejejiwilo.pdfIn PDF document text
    • http://zubrcup.by/files/files/feluramurifatadazuwi.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/milatavexenejujiminosew.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/tanefasokilenalamijemon.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/26384652696.pdfIn PDF document text
    • http://metallpress.info/files/lebevewavogozowedirirote.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/53111945730.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/37731825780.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/8966308541.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nivokifupesinividezetum.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/nimaxixajagivuravoxubut.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905071250617542.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091414453715.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/74558761342.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/69896742565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=stickers+for+gboardPDF 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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 10808 bytes
SHA-256: f29377572aa41c3ba3d713ec8e885edb32b777578cbdcfba2003483020aeda59
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 18120 bytes
SHA-256: 15f5401403d6f7526b736b550570dd12b323710e45027e1ef6061911dfd09253