Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555867a02ef17fc…

MALICIOUS

PDF

76.0 KB Created: 2021-06-09 13:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4950464826596f3c14cd12f72e4079cc SHA-1: 3d39ec4029f140f38bb3430700036f9224a9dcd3 SHA-256: c555867a02ef17fc6af29a0533c08c4d94d460a20d97f88976d0ee6a1465cfcd
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, with a specific detection name indicating it is a phishing trojan. It contains an embedded URL pointing to 'ketchas.ru', which is likely the primary lure for the attack. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it may leverage JavaScript or other embedded content to redirect the user to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/pbw?utm_term=adverbs+of+manner+grammar+rules PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371023/normal_60b8d1b0e9b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_605801ae8cb74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_605d170d1855e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4390081/normal_60b65bd743e95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a0333d25-3e33-4ac1-93b2-1b75d3791161/lecciones_de_escuela_de_pastoral_decimo_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d60553-d435-4a45-896a-c090898a0e00/alamo_colleges_pay_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da85d17-46f2-41c0-b6be-3d3dcfed7182/a_court_of_thorns_and_roses_movie_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bcd166-8db6-4f32-bbb7-811f3938d303/2007_dt466_rocker_arm_torque_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52782a0e-2b3e-4de8-b37f-155ca3235dd3/82288913792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221f987b-0608-4368-824b-26fb5ed8bc04/83772077409.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/how_to_use_cuisinart_burr_grind_and_brew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31d71c4-5317-4174-8471-6f67f191c697/export_regression_table_r_to_word.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144586368/xeluwonodotuturi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784ac1e0-73e7-40c4-801d-71c245cb16bb/ejercicios_para_abdominales_en_casa.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/w/file/fetch/144883476/81173138479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7906770-22f5-4f47-9373-98a3e0d410de/2005_ford_focus_manual_transmission_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05261d43-ddf4-4b00-ad61-656261dd18f0/54978499480.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/arsenio_lupin_libros_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96e9a98-58ce-475e-a8a9-505687b919a5/29349077829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22289d29-a6c5-45b0-a33e-7ccf47571cc4/what_is_the_price_of_infrared_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082253b0-4a67-4e41-be2c-baf55215e89e/what_race_has_the_highest_prison_population.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f027be23-74ff-4142-9ea3-b7aefa3550d2/11510183486.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 5168 bytes
SHA-256: 5a406c4b0fa27c96dfedfe3a9b6e585be3639bd6ad9ff6379c6e55fc3ac1fd4f
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 11092 bytes
SHA-256: cfb9b3b069f27ae0c68d539f73e4561ffd8d8a83691cb38dfebfbf339df5f657
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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