Malicious PDF — malware analysis report

Static analysis result for SHA-256 34467dc22708d692…

MALICIOUS

PDF

81.1 KB Created: 2021-04-01 13:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd84414ced3e7328c8230a720ae2c22b SHA-1: 2ee41d57aa1f9e53c03b35bd3fb90d1506487700 SHA-256: 34467dc22708d6925e84a87a26c717dd2ee1bcb052b3b7ea5a269a784b41558e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to potentially harmful external sites.

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://dafemum.ru/award?keyword=monosacaridos+definicion+y+ejemplos+pdf
    • http://nigemutekilum.mypressonline.com/32302604303.pdf
    • http://penageli.getenjoyment.net/sex_education_season_2_imdb_parents_guide.pdf
    • https://cdn.sqhk.co/letareximo/hejc6UJ/movie_organizer_9._0_software_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4414173/normal_604a686bb2702.pdf
    • https://cdn-cms.f-static.net/uploads/4401696/normal_6020632dec2b9.pdf
    • http://betizekaxu.getenjoyment.net/wepobudoretom.pdf
    • https://cdn.sqhk.co/gebitasixa/Pjcjhjf/35952147181.pdf
    • http://zivemigidefis.mypressonline.com/christmas_music_piano_solo.pdf
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fe12624cf1f9.pdf
    • https://cdn.sqhk.co/kikolibub/hbnLggi/vurotaj.pdf
    • https://cdn-cms.f-static.net/uploads/4494674/normal_60460eaf819c1.pdf
    • http://pupunorip.getenjoyment.net/30272133472.pdf
    • https://cdn.sqhk.co/wemegofuk/xjehnih/electronic_components_sourcing_database.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_ee6ba4aeb41a42898ea924d18d304f41.pdf?index=true
    • http://zutugidod.onlinewebshop.net/waltz_of_the_flowers_piano_sheet_music.pdf
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_71e4b9a08134492bb5cedd9614c3c85a.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d60368e7db5340ff83bd4a53d9526df4.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_0a33a56edbfd427eab6b1f7d8cdc3f10.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc16.bin
8d85954210bb6a34883f80cfe18d13125e9c39cb608c897946146b36f709b96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 5484 bytes
font_01_sfnt_off00010ec1.bin
2ac70cbbe0850db14ba51b761cd3ca8095cf4027b11d44f18b5cb44dbe664aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 12016 bytes

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