Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a501be36e3e4e73…

MALICIOUS

PDF

90.8 KB Created: 2021-06-09 10:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3227ee15889d73f699be9fcb791dcbb2 SHA-1: c8f47fe2c5a7014198668f555ffd7bc3b53a6083 SHA-256: 6a501be36e3e4e73eac39d85147b1c7117c99dc8dd8acafa9207cecb76288891
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV and an ML classifier as malicious, indicating it is likely a phishing or scam document. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain, suggesting it is designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://philabc.ru/pbw?utm_term=my+hero+academia+s1+ep6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392470/normal_605024498a7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_600c0b5d388ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ffe28060b12e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501361/normal_5ff0f7c698d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_606766f6522ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144424533/arabic_calligraphy_fonts_free_download_for_inpage.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144427704/building_maintenance_service_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c45e774-cc77-4d16-9c63-b40589cc3f60/the_rule_of_three_book_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9a0f98-6a5d-491e-bd75-72e6a262517a/p90x_shoulders_and_arms_workout_schedule.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144657096/57244986659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b0b7d2-7ea6-4233-be69-dcebaf28c078/12_week_periodized_training_program_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50679802-4056-482d-ad73-e3c60a11403b/the_little_match_girl_summary.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144676956/99741486589.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/short_story_writing_prompts_for_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d3da2b-5be1-46d0-adf0-7a0133b401a8/kill_team_rules_2018_free_download.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144505056/solar_system_picture_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c436fe2-058a-4ee8-9d56-81bc396e3773/castle_on_the_hill_lyrics_ed.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/photography_portfolio_template_wordpress_free.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/change_32_bit_to_64_bit_windows_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76755ea7-9418-4682-8dff-1c150a32fb47/bobcat_709_backhoe_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 5592 bytes
SHA-256: 12f52e8a2ef96cadc5ae5a9b4732aaf90aad1ab40f8ae6d4acdbd0d4a4d751f7
font_01_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 12960 bytes
SHA-256: c5b8d771047001c9b63c1b48b29b6170df38270f90087d94f0753d285fc73667
font_02_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7