Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f41b0a8b89883…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 22:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59842df3241a4bf09c412d90a0b40ea8 SHA-1: 951a5f09a462261470e5fa73ad9c2c53ccfdb01d SHA-256: 266f41b0a8b89883b83a598f18b993b9084d0638d57c57fece310da6def29f08
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=cursos+de+ingles+en+new+york+university PDF link annotation
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/nejomazelazizowi.pdfIn PDF document text
    • https://kepudeveru.weebly.com/uploads/1/3/4/6/134698703/baworipanotoxav.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/megiwa_vilozetivu.pdfIn PDF document text
    • https://newekozowoni.weebly.com/uploads/1/3/0/7/130738578/5489788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_602b938b63660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_600505cac6659.pdfIn PDF document text
    • http://xufelofimu.22web.org/bluestacks_install_android_on_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fc7e0fd2733b.pdfIn PDF document text
    • http://pavezala.iblogger.org/tisomilamokomobakufigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/848fb847-3083-4d29-862a-7180fc4b86ae/wuwererudorekuvalok.pdfIn PDF document text
    • http://kegurumogebix.rf.gd/formula_quimica_monoxido_de_carbono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a05fcd-00f3-4761-8a46-dc53fe7683d5/womewibebatex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fecbab3-555e-4d35-a88c-8f0af9afe410/77988567119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eeea12-c386-4cb1-a37e-6ee2c04fa1d6/rifajememebivogubusip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d52abd2-af06-4c6b-a066-50e37b38c62c/karolugalogopulejumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adbd171b-1d12-46fe-a124-5fb3bc0cf862/how_to_see_comments_on_iphone.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/20050951422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d49247-5ece-4e62-b619-0ad07af38ad9/70458458108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60bed74-f042-4f88-96f1-d4d9a2afa4c5/86624939685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e350b0-c89c-4e58-8be4-5e5a84dd7f4a/el_alquimista_paulo_coelho_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4c67b6-7b07-455f-8983-40a8be76ca65/time_travelers_wife_movie_book_differences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec13eba7-b6c2-4e99-aad7-34449aa8df24/how_many_carbs_in_taco_bell_beef_enchirito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e0c7d5-d54f-464a-8fde-d5e1b0461ee1/how_can_i_see_satellite_view_of_my_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0549afb2-8e70-425e-9aae-829ba6e900ea/soximikemufi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 5008 bytes
SHA-256: 3a1d973c6ce9af057415998ee5870ce3749393396230390b8eafe1b438344301
font_01_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 12020 bytes
SHA-256: 2269d1b46043d41f56a6efeb2bc3b37af330b865112286527c1717a1b9371c83