Malicious PDF — malware analysis report

Static analysis result for SHA-256 7402b640bf5a4636…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 18:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5764c5ce2c54cace9e5a2bfd74eb9060 SHA-1: c169b5b2278cffc36b0de53083903f9d25f5b5d3 SHA-256: 7402b640bf5a46369f3812fe925e416d63767f94f6af366b4b68805097376f45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ros-audit.com/i/up/file/vupigu.pdf In PDF document text
    • https://queensflower.nl/clientfiles/mikidupi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/24776842126.pdfIn PDF document text
    • https://n-tlg.com/files/file/dasedezikokotulewopow.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/200892646961452ba03e58e.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pasotefafaw.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/bimudofegebapipowu.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/nalatijiwetilagat.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/38778874027.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141466ce4dbe---53631002052.pdfIn PDF document text
    • http://dasbluemchen.com/vodejedogevujikibaxodi.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/konakixubexanafigupedori.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/ropagevojixitigulokez.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/95475906362.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/24018105743.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vadidexowefejanigif.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/wemebulapototinegam.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/8078986064.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/35386692635.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/43253695043.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/jupabelojaje.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/42401284979.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/28732569773.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56212891428.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7hke47h2mknj6fhqla56ulnis7/dasibumelibofubuxufos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chroma+gemstone+mm2+valuesPDF 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_off0000bc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC97 16912 bytes
SHA-256: d7342b27abf9bdccd71e6a4f252f8c5d8c2c6d22226bed644a693eff1f615136
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 10780 bytes
SHA-256: 2dacc2282d8fffe1ebf45538770212eed13a5997e75cda6e949a4b98165acde0