Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1fa371cfc09344…

MALICIOUS

PDF

77.0 KB Created: 2021-06-09 03:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3ddef62f7a54ab902f6bcf85a0742554 SHA-1: 90d8f2dc42c3b1da4a507bc13055c01aa4adea53 SHA-256: 8f1fa371cfc09344cc5cec4b878cb2aad1731e9e3c62c5076073c94967f5121d
126 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to 'archism.ru', which is flagged as a link farm on disposable hosting. This suggests a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://archism.ru/pbw?utm_term=present+simple+present+continuous+games+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4471988/normal_60b41f84cd2ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_6031c9fd7a5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_5fd702cc81b34.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/d38819c6-b8eb-4b35-9503-113c6134a3e7/nespresso_aeroccino_plus_milk_frother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6dd372a-e715-4ebd-9253-19d06286e940/sharp_xe-a507_cash_register_manual.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144464250/60089488854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6f807e-4831-4b19-87ca-b53e949da2de/how_much_does_a_honda_3000_generator_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfe6ce3-d25c-4bea-b24c-d0b08777605f/86643020252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9ec40b-e381-4978-8040-0746ac492795/how_to_reset_samsung_dishwasher_heavy_light_flashing.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144451878/18629214600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a3a8f9-ed40-40c6-9690-fb9d174ad800/47910883086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304b5ca5-6665-42b5-8cfc-45e8a5938247/free_minister_license_certificate.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/free_film_streaming_vf.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144887739/live_nettv_apk_download_latest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6754ba-070d-4c64-a070-1b4b20ba1d2c/somuxit.pdfIn PDF document text
    • http://saxonax.pbworks.com/f/msc_physics_electronics_lab_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0beeef-5e32-4081-9e79-ee1be959948b/69583711675.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144424533/arabic_calligraphy_fonts_free_download_for_inpage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c23196-5447-42a3-a93e-b0f85f84f6aa/leccion_1_contextos_answers_conversacion.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/w/file/fetch/144900102/twilight_1_full_movie_watch_online_free.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/f/lg_stylo_3_plus_secret_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9519a7f5-2342-4440-b758-af879d64f893/fundamentals_of_hvacr_3rd_edition_ebook.pdfIn PDF document text
    • http://jorowad.pbworks.com/f/what_did_thomas_hobbes_accomplish.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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5476 bytes
SHA-256: fd0dfcb0c208bbaecf550b2b40561b77d66f0b0b88ec491465d90e520acba68c
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 11884 bytes
SHA-256: f98a3a09098f50b7199e57d3f6066e81ed8d32902c6c8317c0fb3be6c39e2c45