Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c602ad6c7de82c3…

MALICIOUS

PDF

81.0 KB Created: 2021-04-06 09:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1fffd41c17871a602acacc7763cb09af SHA-1: 81a8cff7eacc969407615d0f911141f2999bb5fe SHA-256: 4c602ad6c7de82c3dd0926549c7bae1a48dd86baadab8e98f3fe9142f74bbe02
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a URL that appears to be a lure for downloading a PDF, likely containing malware. The presence of an external URI and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=area+and+perimeter+of+irregular+shapes+worksheet+pdf+grade+6 PDF link annotation
    • http://goladelexugezi.sportsontheweb.net/dbx_160_xt_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/jdaijyZ/pokemon_sword_and_shield_tv_series_episode_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe5cfaa48657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_602750fc48386.pdfIn PDF document text
    • https://cdn.sqhk.co/gomalajipo/uih12ji/english_french_arabic_dictionary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_606b68407e19f.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/69504136532.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/auidijt/bounce_tales_classic_apk_java.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapulikilep.epizy.com/arizona_cardinals_need_new_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/plataforma_el_ceibo_sancor_seguros.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/lanadizerigukupevak.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_059a2a17f3d74e8dbae0806b365426cd.pdf?index=trueIn PDF document text
    • http://jerekapubujiw.rf.gd/5383406942.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/rbse_class_12_biology_notes_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/xurafis.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/how_to_draw_simple_eyelashes.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/scientific_notation_worksheets_8th_grade.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/medicamentos_analgesicos_lista.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/porter_cable_scroll_saw_blade_change.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_84a25f61ad21485bafb65730cce50d57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/automotive_technology_book.pdfIn PDF document text
    • http://pelidotuxige.epizy.com/42418894805.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_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 5752 bytes
SHA-256: 741b9359cfb9d0e25449e91e67714408c27774e5f218338eabbae88cb81a993c
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 11220 bytes
SHA-256: a64073283edcadbab77d0a922d7a74bb4dbf939e32fed03c9a7cfa1455109a90

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