Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8bc36563fd9a9f…

MALICIOUS

PDF

75.0 KB Created: 2021-04-04 21:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1b55741484300ddb178dd5bf4516c4d8 SHA-1: 2f245e66f7e32aed202ad8b7c59783e611a03ed7 SHA-256: 3a8bc36563fd9a9f4e8d3ac24ad819b4aa0cb725b57dad50636b6b4d77846a6a
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified by the PDF_URI heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, https://kuzutuzo.ru/strik?utm_term=how+to+program+my+suddenlink+remote+to+my+tv, is likely used to redirect the user to a phishing site or download a secondary payload. No scripts were extracted, but the presence of the URL and the high confidence detections suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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=how+to+program+my+suddenlink+remote+to+my+tv PDF link annotation
    • https://cdn.sqhk.co/tijatabov/d99pQje/super_word_search_puzzles_santa_claus_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_604ae50fd9f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6046735024c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/iegjRk7/15150037896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_5fdb35713a5eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fdd43207c82e.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/hhjujda/word_connect_free_word_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/hgsgcPk/poached_egg_maker_target.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/igidKL5/29698827341.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/gzljcjc/five_nights_at_freddy_s_4_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6018dbfd49ed6.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/abvV2kG/79827929639.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/lzGieie/us_military_rank_before_ww2.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/6f558f03-7259-4a28-8510-eaf52c10d84e/guzosumakijiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3585d9-f88d-42d5-9f4e-7876418497fb/50168989590.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/naming_monatomic_ions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/16644475902.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/55551869210.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/forotojofeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07143794-492e-450a-86db-b40a91c000cb/vejipijudotubevip.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/bullet_hell_monday_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/62844387731.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/world_map_continents_and_oceans_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/tupesokowawuxoze.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/black_skin_girl_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/filiwi.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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 5560 bytes
SHA-256: 751b7527f0712eabae29c0747f0472694ead64e76ac0753282dbdb3cdc04b3b1
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10788 bytes
SHA-256: e1abc607e3f7a9f864a79ac8f29f2f66659e9f90141f60df0defe2f3b72df3cc

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