Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aed786b4b620fb…

MALICIOUS

PDF

77.3 KB Created: 2021-05-03 20:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 327d811efe1e6fa3aca73f50da129e36 SHA-1: 28ebea5953483c0a7098d3e0969604a1c2892ca8 SHA-256: 54aed786b4b620fbae205a89b4271641a78b3d9138532f9b666e496ea5e4bef4
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting and redirectors, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=which+submersible+pump+is+best+for+borewell PDF link annotation
    • http://ita-bio.fun/el_movimiento_que_hace_ocasos_en_la8n385.pdfIn PDF document text
    • http://brettlockhart.com/bigo_live_connector_for_ioscjg53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_602ac7b4e9aa0.pdfIn PDF document text
    • http://about-central.com/35662279756xxe1l.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/fsjjGjf/road_limits_racing_2020_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/kqieUji/one-_punch_man_road_to_hero_2._0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_606dd90bda0c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fc5e626cd97a.pdfIn PDF document text
    • http://xususebixaxix.iblogger.org/36611522275.pdfIn PDF document text
    • http://stickerrus.ru/bomberman_classic_apk_app_download46gm9.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/y0iaicP/turn_off_flashlight_on_iphone_11_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/dpWhVBz/anime_wallpaper_iphone_live.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/esmo_guidelines_breast_cancer_screening.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/gangstar_city_games_free.pdfIn PDF document text
    • http://fukesok.rf.gd/how_to_store_sand_filter_for_winter.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/multilingual_websites_templates.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_07e3e65629c1477c9da88e52f5835407.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_a7f9f05961ce4713a303258a41f5487c.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_dfb5e9d533b849648bd0f50421813894.pdf?index=trueIn PDF document text
    • http://nusagimedejaj.rf.gd/solokipefajesakulodaxagit.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/cant_open_my_lg_washing_machine_door.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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 5292 bytes
SHA-256: 301a95c3b53720b0c92174f1bc7a75599b80fb82efa2ab77dd96bc507332bdf7
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 10704 bytes
SHA-256: c13e2843bec40b00193d63a7f04f3d7842d4bc81c98fc350a0abb0004e35ee78

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