Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c108f29882e5a2…

MALICIOUS

PDF

75.6 KB Created: 2021-04-27 08:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b4c9d965148d2d1579d457367347d7b SHA-1: 4409579b90719450752bbd83998a0b2bf3b15237 SHA-256: 00c108f29882e5a2405dedb85f7afdeb8fef4aeafc9440158b385aac548c0103
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also returned a high confidence score for maliciousness. The document contains a link farm with numerous external PDF links, one of which points to a suspicious URL on 'kuzutuzo.ru'. The presence of embedded URLs and the overall structure suggest this document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=why+is+my+kindle+fire+battery+not+charging
    • https://cdn.sqhk.co/goluxewimabu/gfTjhMf/18376239708.pdf
    • https://cdn.sqhk.co/bolukawet/9giLsyi/dividing_polynomials_problems_and_answers.pdf
    • https://cdn.sqhk.co/dorejewibiz/tjaXii6/xbox_360_controller_for_phone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_a78f6cd7118647efb144e8431639bb23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5644117d-ce42-4706-9d3c-15275d4ff31b/9181090653.pdf
    • https://uploads.strikinglycdn.com/files/1b4e4dff-e57c-4c0c-b0da-9dcf0d7e24bf/philips_tv_code.pdf
    • https://uploads.strikinglycdn.com/files/6ae24ed2-7480-4f0f-8fbf-59f9c97b7d17/finders_keepers_losers_weepers_define.pdf
    • https://uploads.strikinglycdn.com/files/e72cd634-c5c3-4f33-945a-ca0eaacd6f32/fender_frontman_15g_amp_buzzing.pdf
    • https://s3.amazonaws.com/pewibim/android_emulator_camera_upside_down.pdf
    • https://uploads.strikinglycdn.com/files/87a89be5-421b-4b69-93eb-de56d15cf4cd/what_are_inflectional_suffixes.pdf
    • https://uploads.strikinglycdn.com/files/6792a68e-fb06-45a7-a035-ae441d131bd8/65893698273.pdf
    • https://uploads.strikinglycdn.com/files/b0767e05-e311-4233-9882-03632dafb9a7/tazusa.pdf
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_86405c8f40a54e568fe22aab8ac9e9d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d55b8da-ce09-476c-ae75-7f8755ba65d2/bissell_big_green_professional_carpet_cleaner_machine_rental.pdf
    • https://uploads.strikinglycdn.com/files/e0b98a8d-7fd4-42e3-a0b6-da98f5681ae7/58213740263.pdf
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_d742992de2614b939890c868616368e2.pdf?index=true
    • https://s3.amazonaws.com/putelekireza/my_family_and_other_animals_full_movie_2005.pdf
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_120129f6e9f74077be031b297b3995b3.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_off0000e855.bin
3cb7770d2b5813af28f03fd191c9bce6bc9e26eb215dc988d5c5b4951e9ea60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5752 bytes
font_01_sfnt_off0000fbd7.bin
00be1bf70535622503a77b254861dae0f0ecea312dde2047cbec3128b9f8989b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 10912 bytes

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