Malicious PDF — malware analysis report

Static analysis result for SHA-256 0749d7cbdb8ba6d3…

MALICIOUS

PDF

80.1 KB Created: 2021-04-21 16:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 97cd9d076b03c19a328d0ddc72fd17ce SHA-1: 858983b89e20fcdc0bb7588319aaeae5c87c292a SHA-256: 0749d7cbdb8ba6d304b3520fcf4d2bb26d5745affc2fa618c30ccb4070ee2620
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'https://pelibifir.ru/strik?utm_term=signals+and+systems+oppenheim+chegg', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, suggests a lure related to 'Signals and systems oppenheim chegg'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=signals+and+systems+oppenheim+chegg PDF link annotation
    • http://persequenteamsohbet.com/tegenebii8i.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/hfjfbe3/in_god_we_trust_coin_2005.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/ha4Khsv/wrestling_revolution_2d_real_names_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zezugiwetibe/hdFgdii/56967102427.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/MOjf2hc/lifebook_diary_journal_mood_tracker_ideas.pdfIn PDF document text
    • http://albl.ru/arundhati_bengali_movie_full10cej.pdfIn PDF document text
    • http://shoop-fl.ru/dyson_dc28_animal_replacement_partsoq032.pdfIn PDF document text
    • http://morpeoplelife.ru/54865865936vvbq0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ddd2631-58c7-464c-86d0-a5d1d8121c04.filesusr.com/ugd/301b85_eb52fa3405174f33b756f30d52ecd490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/10486744393.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_bbc12fd9c0194f829bbfe78ab7817cec.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_2b3f9b8007ca465fb5c715367d0fda19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/beckman_coulter_ultracentrifuge_manual.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_d9ff2fd9d31c42a1bdce447ff1f1390a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0755cb8f-cc5b-4a69-ad35-ee35528adb58/pivizixefenisugabodul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85fbba0-e32a-4349-8537-72ce6539b33f/legend_of_zelda_ocarina_of_time_manga_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/56645319887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abecc3b3-61b6-4c60-a0c0-b92ef5d15e33/what_else_can_you_cook_in_a_butterball_turkey_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d641bc2-c694-447e-9a40-fd1f7e3db02a/cual_es_la_conclusin_de_un_trabajo_escrito.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/87942319922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758e667b-02ec-460b-84f0-b8d22033b907/65743974158.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_2c8fc7a9b0644b5e8f17acfd3b30c8ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzujewa/app_store_won_t_or_update_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b467192-3249-4e52-83fe-371e703eca27/safixaparomizapusixu.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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 5596 bytes
SHA-256: f606de92890182bdc42e6f571893e518ccf324c0c685d43eeef75d58ca680c90
font_01_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 11168 bytes
SHA-256: d73ac692ccbfd4bfa0f51536b9a7c82b27715d9eb0debd652a5af169513d3fba

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