Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bacdcd4b7a55b92…

MALICIOUS

PDF

78.4 KB Created: 2021-03-05 04:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79b2a95a3f98b11eb40ca7d596e38ac8 SHA-1: b27b825ebd9ae02ed1483f8a6f3cf0f0e6aa5bf8 SHA-256: 3bacdcd4b7a55b92a7cb71e42dc8f7ba818bf0e437e93dcde10d20954e0cc6f8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://seumenha.ru/123?utm_term=acer+aspire+one+722+notebook', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/123?utm_term=acer+aspire+one+722+notebook PDF link annotation
    • http://vugekowuzujed.scienceontheweb.net/how_do_you_get_transgender_surgery.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/bissell_spot_clean_proheat_pet_portable_carpet_cleaner.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/roxewamujoreje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_cd9da3e4d71a47eba83f5463693b5602.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_3d8da4ab525f4112ab91a4726c01af98.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_b1c17446e18a47e994a4b9a7950e2fa0.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_f62ef8c570084adf91796a1166aebe94.pdf?index=trueIn PDF document text
    • http://zisukuvi.atwebpages.com/can_i_leave_ryobi_40v_battery_on_charger.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_02d578b37cc249cc96ab630ecc208fd1.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_9c0a2ca3d6b44df2a5a64ef886687d57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/38753487885.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_5870a83230774209bd52e0187017cc46.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_5cd0bf56e683410887b2c7a841876542.pdf?index=trueIn PDF document text
    • https://65073a1a-0d84-4e9e-a472-5d702f6aa780.filesusr.com/ugd/c34eac_cae2664f6b674617b357d4e22901db46.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_8dba0c1180b349d3a75a835fcd8d8a6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/30712589612.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_115fc3f62cbb424594134088cb01c1a9.pdf?index=trueIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/what_is_the_importance_of_heat_in_our_daily_lives.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/71705700726.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/bujoziranutum.pdfIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_2dd3007c7887457794110d18370a2bd9.pdf?index=trueIn PDF document text
    • http://ranitirunom.myartsonline.com/vampire_diaries_script_season_1.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 5300 bytes
SHA-256: 61ca4590a0d9f4fa259c224416413a7db87441614b006171d8536696b16d2c9e
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 10640 bytes
SHA-256: 210968064f65c479e925c5ca51fc4c8a5204f91daf334f6a3440d59b917d8e77

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