Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5035e602585481a…

MALICIOUS

PDF

78.8 KB Created: 2021-05-30 16:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65302cf98c9c7d4d80b607d78beced5a SHA-1: a9471cc4dbd2d8b027ccef31d9d58f3278c27ded SHA-256: a5035e602585481a269235a64ba3cb0bba7e197fc7c0750ed32e36de28c3bc6e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=imap+path+prefix+yahoo+android PDF link annotation
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/megilolisojipu-nupoxiputimiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fe53a8fc032d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_5fd23355c5bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_605b6be6c3201.pdfIn PDF document text
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/43bbacc886bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_603d89a75f03e.pdfIn PDF document text
    • https://xonugovelixef.weebly.com/uploads/1/3/0/7/130739086/b3249b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_6050f65581447.pdfIn PDF document text
    • https://pajudeva.weebly.com/uploads/1/3/4/6/134657304/wejumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_603c861e8c100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_6056dfe9da3fe.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/3196897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b455cd2f-c20d-4b4c-9d20-c2dfffd9f8d2/ejemplos_alcanos_alquenos_y_alquinos_ramificados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1fab49-9876-44ab-af6a-cf63b923d4d5/too_busy_not_to_pray_ebook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4807cb8-aee3-4e05-b651-27a9446f2600/99166929516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd5fe76-f7bf-4121-8374-993307984c2e/hp_probook_4530s_i3_2350m_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35c38f9-2b59-4771-93f2-4baba07f5dad/vuzitelawojebuzixemuros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761c8ab7-def4-49a1-bae5-7391754ec118/mary_poppins_disney_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2d8a78-c3da-44b9-a626-cdffce548dd6/car_aerodynamics_simulation_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d60528-6127-4342-9727-ac92de08e41e/does_ahsoka_appear_in_season_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c22969b-b88c-47ac-8935-41a510b3defd/91554383849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9b5a24-8e2a-4a91-b6d0-e977cd41267c/girl_scout_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09041501-2f91-4370-a58f-1ccfc0b093e8/what_kind_of_oil_does_a_worx_electric_chainsaw_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9e5d0c-ef43-4242-a8fb-3fe4358e3037/hp_folio_9470m_elitebook_price.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5176 bytes
SHA-256: 9a86fcc8c5186d180bd3ff98171fdac5df0ea803101af07a16dcacb0f37f3c1b
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16652 bytes
SHA-256: 08b7613e8ed0a8cdf6f84cc88e9b137ac505eafd4507d6734b54cd07a83d27d1