Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c49c1022f1c846d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 00:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08443676437efb7b4fe59111d0950789 SHA-1: 5ad72a08557bd171cfd248df9f50100d22472c4f SHA-256: 4c49c1022f1c846db06950f8d08561e27f8eaf59ec7adbbe7373fb5e6b3fabc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one specifically targeting 'teams office login' and hosted on a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=teams+office+login PDF link annotation
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/70191323079.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/1602094216.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/wazuvawefaduwepatatonatod.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/50545101404.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/jizulo.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/wusifoligivofeginijaxo.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/nabegeri.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/wugofuratigiwuxi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/84194985077.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/53813981863.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/wajavowewabu.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/19809336983.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d276b9cb---14014136517.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///54817370955.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a2fdb0fab71f8512c6dabd13c5272c7/vopuza.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/48544115126.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/44175166209.pdfIn PDF document text
    • https://pcetravel.com/files/file/62287671438.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/26903171952.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/pewazoza.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/rakaputog.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/69535541627.pdfIn PDF document text
    • https://beaszemin.com/files/2732433765.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gudazugesodegabur.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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 19352 bytes
SHA-256: 6e7027d39125e0d3348ab6d8cff84c6d8f03bee84c4b27664e3b84fb3b117204
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 10444 bytes
SHA-256: cf315054a8fa99ba4ea0d5e67f03273e05f2e5f626a5f57861a450e7524f9511