Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55d9140f9e869c7…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 03:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52c84542bc3c137b9cc400521bfc7121 SHA-1: a10cceb6ef80c462c876fb3a83a28a403d5a0b10 SHA-256: d55d9140f9e869c7ce91b9fae07a75e9f17668c0a579ff93d5800a217fdbb965
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs pointing to disposable domains, indicating a link farm or phishing lure. The PDF structure and embedded URLs suggest it is used as a delivery mechanism for malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://lozipotod.ru/award?keyword=biuret+test+for+protein+lab+report+discussion+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fdce03abc1fc.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/how_many_books_in_the_black_company_series.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_603929588f592.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/gjjjic3/jeganozevukebivasajofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_604b11814d9d1.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/array_using_pointer_program_in_c.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/bubimiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_601fe79ab2201.pdfIn PDF document text
    • https://cdn.sqhk.co/rowunozimop/eifYidj/fox_sports_go_roku_something_went_wrong.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5fecc76ec337e.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/pojogexivorusemumuzaxudej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_602aab928104f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofujuwo.onlinewebshop.net/xapime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f968e82c-c81a-4a2a-abdc-9b0ef81dd73b/25128233388.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/fixonofim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6c7d99-ecaa-4422-9052-c67a223c48ef/broan_allure_range_hood_filter_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/774c9872-1da3-4abf-8235-9c6eae0a8842/84458397095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ba34fb-37b7-4cd3-8cff-7e2771901e43/handwriting_analysis_quiz_online_free.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/26530705132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c239025-71de-44f6-8ba1-b7a149af1b20/journey_to_the_east_book_spalding.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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5336 bytes
SHA-256: f79459fa477f05088fde8b5023750e54bcdf8136cf1b9221df80a0174d62ae35
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 10960 bytes
SHA-256: 9bc42f8330af1107535a1520b80d064d534fe83f72c42f04ca5758e25de81a59

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