Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de7ff85411a8be8…

MALICIOUS

PDF

80.0 KB Created: 2021-03-18 21:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da9cdac82ee939560123f21c052ca85 SHA-1: ee784a6bb482b39dac482c5d9328caccf1c28ba0 SHA-256: 8de7ff85411a8be88090fe472830689d6278880c2bca6d0fe1c30f6a270268ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing lures, directing users to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://seumenha.ru/award?keyword=business+development+executive+interview+questions+and+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_60310572dfc6d.pdf
    • https://cdn.sqhk.co/wegodimumod/Vibghja/yoshi_s_island_ending_theme_sheet_music.pdf
    • https://cdn.sqhk.co/sepagumal/6ggifJT/79210153090.pdf
    • https://cdn.sqhk.co/tisufupujeli/dVfjjhb/24814847117.pdf
    • https://cdn-cms.f-static.net/uploads/4470972/normal_5feaeeb20733b.pdf
    • https://static.s123-cdn-static.com/uploads/4380079/normal_5fee19b6dcc25.pdf
    • https://cdn.sqhk.co/ruwonumatag/eu1FjbX/6992608457.pdf
    • https://cdn.sqhk.co/xexanodu/WIujbij/new_word_games_online_free_to_play.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_b9655054eac4488ab3e8f37d93ac4716.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d40f58e7-8798-452c-b656-ffa0045988a5/36074457772.pdf
    • https://uploads.strikinglycdn.com/files/2182314b-287c-4609-8040-41021bf5cd17/fuvukuweporonaxifumipiwal.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_a9ffe5c9098745a7bd68227e082fe361.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_b7b5401671e44098b3babb7176decc01.pdf?index=true
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_0c09688e7dde48098d0ee18602d8cda5.pdf?index=true
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_7a21bc87591a4ee28893191da4bb317e.pdf?index=true
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_4cd279f4db874b5fbddd5d3a112c5425.pdf?index=true
    • https://s3.amazonaws.com/baxunaf/pukug.pdf
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_0c22a177ec814f3ea2800e1ae8de91d7.pdf?index=true
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_04b74cb7add84add8f9a83be09f17722.pdf?index=true
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_4e733a0f6cf34acb9188153cb11d89d7.pdf?index=true
    • https://s3.amazonaws.com/ziwuvijevo/boyner_vans_old_skool_platform.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_e5ebc7baa20a4159a0b0684e89cc0d5d.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_off0000f971.bin
229c31ac8be04d205b85aab8d04e9b45f7d293ab41a6bd54638fa2af2ff8914c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 5696 bytes
font_01_sfnt_off00010cda.bin
de5b81549fca3a87fc70360894540f94ce7cda651c6d809512431bcc5a10888f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 10880 bytes

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