Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99ad135ec1e00f9…

MALICIOUS

PDF

68.4 KB Created: 2021-03-26 02:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92479ad7f77c5354ef630a208239e48e SHA-1: e3f0e01cfed7eb129b4190f7c9e3d86630791837 SHA-256: f99ad135ec1e00f929d03d5a70fa0a965197428aef13e3b3ec93cb6ebc272ca2
104 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to appear as search results for specific documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute or redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=practical+english+usage+fourth+edition+pdf+free+download
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ffc874ea99e3.pdf
    • http://xapiduxirob.mywebcommunity.org/antenna_theory_basics.pdf
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe41ffecd941.pdf
    • http://wufamega.scienceontheweb.net/what_are_some_facts_about_police_brutality.pdf
    • https://cdn.sqhk.co/jowapezo/Ljhhicy/52374497027.pdf
    • https://cdn-cms.f-static.net/uploads/4475995/normal_6032e6a530c12.pdf
    • http://juwaniwabi.medianewsonline.com/alberto_caeiro.pdf
    • https://cdn-cms.f-static.net/uploads/4374518/normal_6012964282fc2.pdf
    • https://cdn.sqhk.co/tezesafura/ij4wfTd/catan_junior_dice_tower.pdf
    • https://cdn.sqhk.co/gevagedubop/avvgdqt/24235488075.pdf
    • http://sixesijilolun.mywebcommunity.org/tutorial_of_ms_excel_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_021e868f75394473b4df3bd4f5118147.pdf?index=true
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_ec92758b7c354fb984677fdd03550d9b.pdf?index=true
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_70c6bab09d9346b69932d59664cb86d3.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_e8d28f44f8ef4ab08d312228a9c43ffd.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_5bb3e37222ad4ddcabb71ff114e406e9.pdf?index=true
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_e3db382442b84b988242301967c020c7.pdf?index=true
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_e3e8f262d71b42148fd7bd4830625853.pdf?index=true
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_1365ff44b35644e7a84f920ed5cbe4ec.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_off0000cd9c.bin
73a74ad0bf537439bb2d4ace4d7d3d6db1a3bf21348b1fd8aa75034341692466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 5508 bytes
font_01_sfnt_off0000e062.bin
2a2fd6e76fe69083bb9381f6dbcb042e5cd6ff86ac2d1a48782802d8b2a5f43b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 10412 bytes

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