Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b63f4b65dd541c…

MALICIOUS

PDF

96.0 KB Created: 2021-09-17 09:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22e967e215fae0aaddee01b38f6c1795 SHA-1: 459644afb9273d2aa212b694370ca928f5c72607 SHA-256: e9b63f4b65dd541ce85e3f24864852286058e6c4d0adefa1607f5fe1ad7e9e1c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The presence of 'wkhtmltopdf' in the metadata suggests it might be a generated PDF, possibly for obfuscation or to bypass detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://garglob.ru/uplcv?utm_term=android+ui+creator PDF link annotation
    • http://geologocarmignani.com/userfiles/files/46775403909.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/89726871394.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sqbi62mh0u73d49iojo5qi8ps5/9119769375.pdfIn PDF document text
    • http://chamdure.com/DATA/files/falumotosawusonajonazema.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jenifodog.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/40595836617.pdfIn PDF document text
    • http://partnercable.hu/files/29618184814.pdfIn macro / runtime command snippet
    • http://homokkepek.hu/editor_up/fejeboke.pdfIn macro / runtime command snippet
    • http://wuchem.com/upload/files/45655571779.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/83971557200.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/falisogetewe.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/72254762463.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/99439088628.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/17458910224.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88439232465.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613091dd4993f---64148116989.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wogivivesonagogoberazagi.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/84680621306.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bakigasigefazubudesajuna.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15408753475.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nonolurafefarazunigaxu.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kapuvoresawoweruwerabum.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/99200319314.pdfIn PDF document text
    • https://motoralbini.it/files/file/xawofabopewemadaf.pdfIn PDF document text
    • https://cian.hr/userfiles/file/20372131471.pdfIn PDF document text
    • https://www.acta-mobilierIn macro / runtime command snippet
    • 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_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 10228 bytes
SHA-256: 58473dc0043f86c040d5ae44bbd3c60d0a56990e870fbdd8e7983a738c98a3d3
font_02_sfnt_off00013fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDA 18972 bytes
SHA-256: fed3a3f251a47580f4935cfc944226a43f5d9e3169b615d3f0fbf1ddcd7ed87b