Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8946bfea29abce…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 08:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d532afd5e2a7a9ce588a612ee07c9f9 SHA-1: b751474dbec7bdf7aca85d2f9a4550314d7343de SHA-256: 5e8946bfea29abceb0ef1d43054b5025c3cf6c533aa2d0c119b55c1cc51f1891
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF URI link farm. One prominent URL, 'https://maypoin.ru/award?keyword=ancient+greek+empire+pdf', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=ancient+greek+empire+pdf
    • https://cdn-cms.f-static.net/uploads/4368768/normal_600eaf931fe79.pdf
    • https://cdn-cms.f-static.net/uploads/4368982/normal_605b1705bb857.pdf
    • http://uuuuull.space/loxujidafajopamhmxf9.pdf
    • http://creditreportfast.info/lugutixuserakegutubajixobs85us.pdf
    • http://vvinorama.website/la_llamarada70cze.pdf
    • https://cdn-cms.f-static.net/uploads/4386349/normal_601855166640c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitidadufetenu/98299005754.pdf
    • https://uploads.strikinglycdn.com/files/52f89cd5-a494-4097-a0ff-ede8ed5dc1c6/c_programming_language_course_outline.pdf
    • https://uploads.strikinglycdn.com/files/604c154b-717a-4559-a15a-4b860516ae6c/27728114411.pdf
    • https://uploads.strikinglycdn.com/files/a4b3b87a-6a07-4bc3-be7a-d2c98069a9b4/49107775809.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_9afc5b4067a74933b229fde5cd19fb2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1e55881-7ecf-4776-8df4-e13c7fd46fb7/83784123651.pdf
    • https://s3.amazonaws.com/tikoweravisixu/arcane_legends_mod_apk_offline.pdf
    • https://uploads.strikinglycdn.com/files/aab1647f-58d7-4364-a10d-c85c9dbdff4e/que_es_una_composicion_escrita.pdf
    • https://uploads.strikinglycdn.com/files/95a6f566-0b0c-442c-a497-bc3d14d03479/skyrim_alchemy_easy_recipes.pdf
    • https://uploads.strikinglycdn.com/files/175ad094-477b-456e-b827-97c89bd174eb/noxulewawatiziwedogak.pdf
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_0b35000a0b304f9e8b4d843f512aa2d6.pdf?index=true
    • https://s3.amazonaws.com/legesiliv/whatever_after_book_4_read_online.pdf
    • https://uploads.strikinglycdn.com/files/41ccf620-7af9-4bcc-99d2-ddf476c86613/como_encontrar_cupones_gratis.pdf
    • https://uploads.strikinglycdn.com/files/1e820ebe-a02a-4eeb-884f-49d6689c0d4b/percy_jackson_and_the_lightning_thief_movie_grover.pdf
    • 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_off0000f0ee.bin
f6418c42de5c5ec1ba8509badf924d5f541ea7d36a06443a8db0f27aa7e89ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 5108 bytes
font_01_sfnt_off00010249.bin
79e64f4358ed28f6e8711cb6e2268a9defece05b53d6152ffe85c627ce0929a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 10992 bytes

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