Malicious PDF — malware analysis report

Static analysis result for SHA-256 767d7bd9b3f97493…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 12:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f88c7be72d3a6dd5be03553536daab88 SHA-1: 891e002482e99bbf6780819e54df1d3a55acd3ea SHA-256: 767d7bd9b3f97493525468de5f3193c638a5ecd7aa0d60af21d834083a6a54f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using many distinct, disposable hosts to obscure the ultimate destination, likely a tactic to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zaragozadenoche.es/upload/files/79325098250.pdf In PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/69316436994.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/67427080441.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/weporuruvofarukaka.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/31742806343.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614209063e773---vilasilunifu.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kopewutatozamafo.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/45968439765.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/80326947818.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/vitokej.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/46099439304.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/82742129633.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/romesagiweve.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/dadanopu.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/25511602749.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rodegupipopamodadezuv.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kepalexivufedajavozemita.pdfIn PDF document text
    • http://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/40114650095.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/67675901865.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/zixiketenufug.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/37049695688.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210913185226782788ggy97.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/fifebolafekifoxokobet.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/48235101542.pdfIn PDF document text
    • http://prograsifkalip.com/files/41494165472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=asphalt+9+legends+android+1PDF 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_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 20880 bytes
SHA-256: c720659699e6cf17baed8b416c8db0e7f688c2c0858282c1539607f2212870a3
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 10872 bytes
SHA-256: 76a1816a71c493d9c8673713354cee74775f5188742cd003b82719763054afe5