Malicious PDF — malware analysis report

Static analysis result for SHA-256 221e2b166911366d…

MALICIOUS

PDF

76.7 KB Created: 2021-03-04 06:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5cc41ca8ff675c7a1511491b443d7b59 SHA-1: 7c6ff3ebea591aed3fbf81ced753b58ea52a7e71 SHA-256: 221e2b166911366d17bef8ef91cd6c14f9fe575ab2d6f592391e2453c87b5a0c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, and multiple other unknown URLs are present within the document. The presence of PDF-specific heuristics like PDF_URI and EMBEDDED_URL indicates an attempt to redirect the user to malicious content. Although no scripts were explicitly extracted, the nature of the PDF and the embedded URLs suggest it is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=weber+grill+cooking+fish PDF link annotation
    • http://kinoxca.xyz/juzulosarefogizisogisesaz27jgp.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/ickm3hh/kafunomador.pdfIn PDF document text
    • http://file-id.ru/aces_high_march_sheet_musicbhcm0.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/bapetemanixe.pdfIn PDF document text
    • http://constructionhouse.info/mobexuzegevuwary7t7x.pdfIn PDF document text
    • http://submonster.xyz/test_de_la_figura_humana_interpretac3qxpq.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/jVRnhgT/islands_for_sale_cheap_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nurafurofopu/cijhdJ6/candy_crush_soda_saga_cheats_level_400.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/6ifbpie/97932123099.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/how_do_i_unlock_my_whirlpool_washer_door.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/gji8Hgg/retro_arcade_games_system.pdfIn PDF document text
    • http://katipef.medianewsonline.com/a_commentary_on_kants_critique_of_practical_reason.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/dewutexorob/character_ref_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/alone_in_the_universe_seussical_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/sujekodinebigibagik.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/arc_length_practice_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/mode_of_nutrition_in_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/guess_the_brand_answers_pack_1_level_150.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/20787379788.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/tree_of_life_tattoos_for_females_small.pdfIn PDF document text
    • http://jokosen.atwebpages.com/aguda_llana_esdrjula_sobreesdrjula.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_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5148 bytes
SHA-256: 90f609fd023a368c4b7e2746faafb817f1abc1e7a6f6ec8315ed2c4fe0632989
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10548 bytes
SHA-256: 1bc0432c6a96d2298a62ccf8c33d6eddb47d61e5ffece7ed3646591b65ca423d

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