Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8d3e05bc7f9cb1…

MALICIOUS

PDF

97.2 KB Created: 2021-04-06 15:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074835b5ac15ba695ce78c6d0f80df92 SHA-1: 73a02d49787feefc34bbe7fefa727ee9cbfe8a31 SHA-256: 0a8d3e05bc7f9cb1f1780810de46c5e97ebe0955cfae3eed32997c124b006aca
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, which is also listed as an IOC. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure for downloading a book, suggesting a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=eragon+book+4+pdf+download
    • https://cdn-cms.f-static.net/uploads/4501634/normal_605003d2a371b.pdf
    • http://dodemul.mygamesonline.org/best_app_to_learn_chinese_2019_free.pdf
    • https://static.s123-cdn-static.com/uploads/4454665/normal_5fee36edee100.pdf
    • http://kerutugizuxig.mygamesonline.org/job_description_for_digital_graphic_designer.pdf
    • http://vumajufeboxidik.mywebcommunity.org/maths_addition_and_subtraction_worksheets_for_grade_1.pdf
    • https://cdn-cms.f-static.net/uploads/4377115/normal_603766a092b74.pdf
    • http://sogejovep.mypressonline.com/cambridge_practice_tests_for_pet_1.pdf
    • http://kazedoruredupe.22web.org/georges_marvellous_medicine_grandma_character_description.pdf
    • http://fisujerekuvij.getenjoyment.net/finding_volume_worksheet.pdf
    • http://mekomob.getenjoyment.net/90603468767.pdf
    • http://nozumupi.medianewsonline.com/evidence_for_evolution_pogil_answer_key.pdf
    • http://rawoxaxevog.mygamesonline.org/what_is_a_flavor_wave_turbo.pdf
    • https://static.s123-cdn-static.com/uploads/4390056/normal_6007a4b2e076c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_361cbde5c8474a83882759ed40afcf86.pdf?index=true
    • http://jagivaxo.rf.gd/best_book_on_signal_and_system.pdf
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_6fd93f94d6a642c295afa981efcbba19.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_7a3847a074c24b8aaff799817c314b4a.pdf?index=true
    • http://rabovawixi.rf.gd/how_to_replace_disc_drive_ps4_slim.pdf
    • http://ribubawomog.epizy.com/52200870043.pdf
    • http://widokox.rf.gd/operations_with_rational_numbers_worksheet_7th_grade.pdf
    • http://rabelame.atwebpages.com/lumowovikotoreko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139e8.bin
a2b676793acd87e24227e7c922278ca7c3ac8a2702cb4b3ed7c4b8f04487dd01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 5372 bytes
font_01_sfnt_off00014c5e.bin
fcb5c69441eb6b7244081c1f82ad3850a08c7f8e7719bc13dccec7f004048c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 13600 bytes

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