Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb5463129e76d02…

MALICIOUS

PDF

76.6 KB Created: 2021-06-13 09:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987bbe5d1ccb5c0c687ae2572591d495 SHA-1: 06f41c5346d095135255d815facd2790be4540db SHA-256: 8fb5463129e76d02808864422a7148abdbd092917dd55a628d7860971e00a2d6
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains and are likely part of a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/pbw?utm_term=8+bp+mod
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/1b0172e065ba.pdf
    • https://suviliter.weebly.com/uploads/1/3/1/4/131453542/f7886efe116dd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb604fef-8c4f-4c79-9215-85e2a5cd128a/can_i_drown_in_the_dead_sea.pdf
    • https://uploads.strikinglycdn.com/files/7d1f9cff-5bc7-4a18-bf20-6b8d446798cb/how_to_factory_reset_line_6_spider_v.pdf
    • http://kuwupib.pbworks.com/f/satelokojekamesir.pdf
    • https://uploads.strikinglycdn.com/files/8ea86153-5f6f-4c4e-b542-84281f057fe9/pumegupije.pdf
    • https://uploads.strikinglycdn.com/files/c1804c52-d849-4aad-9f8b-4a6ce648762d/best_dd_online_character_sheet.pdf
    • https://uploads.strikinglycdn.com/files/e2611e7d-cb21-42ad-92f0-4f0b2021121e/66671101854.pdf
    • http://namikikis.pbworks.com/w/file/fetch/144705144/grammar_practice_for_pre-intermediate_students_with_answer_key.pdf
    • http://nitezug.pbworks.com/f/how_to_imprint_on_ark.pdf
    • https://uploads.strikinglycdn.com/files/7c1b2d5e-5bd0-4a23-8836-a3026e4fb11d/what_is_the_smallest_roku_smart_tv.pdf
    • https://uploads.strikinglycdn.com/files/6e38a1b4-89fc-46c0-a598-ff7f1668a0fe/wifed.pdf
    • https://uploads.strikinglycdn.com/files/904dcbee-9e69-46fe-ad2e-0183ec09f472/battery_tender_red_light_always_on.pdf
    • https://uploads.strikinglycdn.com/files/110c9a1b-7b4b-498f-b5c4-cac76cae1e7d/weterukurozagudar.pdf
    • https://uploads.strikinglycdn.com/files/1b063b91-85b5-47d7-903d-77af75b50b49/tetobamix.pdf
    • https://uploads.strikinglycdn.com/files/4998b6e6-e717-4df6-9cf8-bc56d31c1e3e/22168471316.pdf
    • https://uploads.strikinglycdn.com/files/a5154149-ee75-4949-ada7-4b1ebbbed4fd/what_is_better_a_pit_bike_or_a_dirt_bike.pdf
    • http://kekirow.pbworks.com/f/kakebunowadulome.pdf
    • https://uploads.strikinglycdn.com/files/a9e1f162-9247-4b2b-8509-978212bf064d/first_day_of_school_script_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/e3143afa-8595-4e7d-8410-3183e649ce80/diet_plan_for_lose_a_stone_in_21_days.pdf
    • https://uploads.strikinglycdn.com/files/e1cc9fb3-f649-4ee8-8320-7ff0b174a5ef/how_to_sign_up_for_financial_peace_university.pdf
    • http://fudejob.pbworks.com/f/38160725912.pdf
    • https://uploads.strikinglycdn.com/files/d07e87d0-c9ec-4dc0-862d-8bf22f031f9e/how_to_fix_volume_on_verizon_fios_remote.pdf
    • 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_off0000f01b.bin
2f1dda76c838d079881a2614c335b51a6b6224f7a178711782e4eacdd5eca6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 4828 bytes
font_01_sfnt_off0001006e.bin
198b66c66d98e9f53fe5a85a05e57ed56cf17f8891a122128b8bece935bfc5ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10936 bytes

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