Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a5baec1b90071d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 03:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d698b3bbfd259a1738488f4c6629f8f SHA-1: dadd4a91a077b9a5eecfb4e86fdce7739ace9942 SHA-256: 15a5baec1b90071d6e44cc58fd9a1b405e54b6150c565a37324747a6ff49392a
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links. The primary URL extracted, 'https://seumenha.ru/wix?keyword=end+behavior+of+a+polynomial+coefficient', is part of this link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious or SEO-abused content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://seumenha.ru/wix?keyword=end+behavior+of+a+polynomial+coefficient
    • https://cdn-cms.f-static.net/uploads/4459916/normal_602ed0f07ceac.pdf
    • https://cdn-cms.f-static.net/uploads/4378613/normal_602fa3ce33f51.pdf
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/dobekemanexiwoluke.pdf
    • https://cdn-cms.f-static.net/uploads/4460471/normal_60419a7ba0858.pdf
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/damidesusofolunix.pdf
    • https://tikamujajinug.weebly.com/uploads/1/3/4/4/134467206/limodogimur.pdf
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5ff88cb60468e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ea1bf2f3-b374-4960-a041-09bf4d3047af/how_to_draw_involute_gear_tooth_profile_in_autocad.pdf
    • https://uploads.strikinglycdn.com/files/0c8e5696-45ff-4d24-9546-8675869e1c8a/whats_your_zodiac_sign_if_your_born_in_december.pdf
    • https://uploads.strikinglycdn.com/files/5848cf10-2d49-4017-90f9-cf6d9e9d856f/how_to_recover_from_gum_surgery.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_bf946f9d8993466fb6b5a21f47d80f8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/153066a1-ee18-4eb6-9f55-b5e81e8381d6/sodalakalogetaware.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_d6f66b1ad100470cb406800b7f4c765d.pdf?index=true
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_be13789721634b2b9732d89d69067290.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ec88619b-9df0-4c8b-b75f-74c3bdcb43e7/bapumiwafiwipupesapexop.pdf
    • https://uploads.strikinglycdn.com/files/f0a102a2-773e-4a4c-9ee3-5f40610e421e/bushnell_neo_watch_review.pdf
    • https://uploads.strikinglycdn.com/files/dfb663f7-f6cc-4dab-8468-b35ec1488727/craftsman_snowblower_parts_edmonton.pdf
    • https://uploads.strikinglycdn.com/files/8c353ba2-1216-48a3-9603-93975036a0cd/6589746104.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76d.bin
ba42b13451597982188aaab76b1c349ce1f4d8b34f6d18df88a30b0d968ff62b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 5264 bytes
font_01_sfnt_off0000f931.bin
fecd02d8a290baff448d6e3ab584d3506365137025813ffe9e935cf1311e6b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10940 bytes
font_02_sfnt_off00011e69.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 4324 bytes

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