Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e45fd42ddbbe21…

MALICIOUS

PDF

76.4 KB Created: 2021-05-11 05:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fde7005da3eeca2e3076487252e25ed4 SHA-1: 7f2e17cb4518f8a1bcc474d7de4c216b6de30600 SHA-256: 20e45fd42ddbbe21323cff6a1f9cfac00e5d2d1129970c8e5ce72caa2f3ab8e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed for SEO manipulation and potentially malicious redirection. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery via the embedded links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=first+edition+harry+potter+book+with+typo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503387/normal_5fd1e2c8145f4.pdfIn PDF document text
    • http://topsale.pro/94211403593bbyro.pdfIn PDF document text
    • https://cdn.sqhk.co/sozedikepasu/ienYjiG/best_site_to_bollywood_movies_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/iYgajeZ/ldl_cholesterol_test_procedure.pdfIn PDF document text
    • http://lirudizulizi.iblogger.org/tozadajazujogog.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/jgphcja/art_of_war_book_summary.pdfIn PDF document text
    • http://sodiwemewobigi.22web.org/32936799550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_601687f937b16.pdfIn PDF document text
    • http://itchia.space/spreadsheet_functions_to_organize_dataqtpo4.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/bPthcIz/foosball_table_parts_and_accessories.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/ghghfjj/slot_machine_game_app_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_60186afa75126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6020a5ee2e23d.pdfIn PDF document text
    • http://fukanaduvubife.22web.org/lovudukuxod.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/258063dd-a1b5-4b72-a801-12a1aefdf909/birezezejinag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d473a640-824d-47d2-b5ed-adf57168ada4/comptia_server_study_guide_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a800b08-7892-4b22-9ebf-e47034387715/monster_inc_meme_mike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dab90f0-63d2-4dd6-b2e4-f5a070339063/jemuxodefipilutukik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77922f7b-5fc9-44c3-8270-b08ed7b224de/jikabuletoviloga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98edf85-b161-42b6-9081-964e5e9ea66e/how_to_tie_a_mens_tie_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8332d045-a109-4259-855f-53ae0310854e/28105507637.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 5368 bytes
SHA-256: f16b507863f548daf2745c723cba7560ecd954778540248d46ac3cfab1ba93bd
font_01_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 11260 bytes
SHA-256: 562af7a8032c6133667d7bc4fb033ce8059e182acfe980fb313d44fbe0d3b839

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