Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5a05a33ec46b85…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 15:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f9f00deffda8ea488ccb2347b0755a8 SHA-1: fe5027b158a1bd20a6f4616f859a29f26664afb7 SHA-256: 4e5a05a33ec46b853772ef0183cd75e51a6bbe57fa0e3fbd355cefd440bb74bc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5624

Heuristics 4

  • 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
  • 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://maremio.ru/admin/ckfinder/userfiles/files/ragaguvagegatanebarefo.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/wewujotumonadotomijizida.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/3827918337.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/72217909933.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/piworexede.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/88813925298.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/38575452690.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/gidusot.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xinati.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2524c087---bejeduderozisewowefe.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///dukagafalanasig.pdfIn PDF document text
    • https://reniuved.it/file/kusijejamonitonotixonaru.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ijbra4qhti4jngm4vqf3r7hn7/93509081549.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/gamogidapelitanolel.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/62908370306.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/wajemovulisijetaximonav.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fotisolaxuzi.pdfIn PDF document text
    • http://tiquital.com/documentos/file/63364998814.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/gugiziwusalasumarobodo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908025008522331.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/xikatiwodelikemilugebu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/52376626058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=consumer+behavior+psychology+marketing+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 11612 bytes
SHA-256: 539a41488a05a8c6d2edf04a021d334f3472290a31e12cbecdcf176fe3fff74d
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 19344 bytes
SHA-256: 6fd13c906c14dcbb1ba6662ed818276725ea147fa34a279758a90af1455be183

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