Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef83576cfad38694…

MALICIOUS

PDF

72.7 KB Created: 2021-06-01 03:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bb182443aef47ee8a7c9b6fa558522ec SHA-1: d104f067a7a824f18cd3d62d7349dc835604777f SHA-256: ef83576cfad38694f88a08344f627a28ff7081acb50d17cd889cf1ee05489695
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a URL that appears to be a lure for downloading software, combined with heuristics indicating a remote support tool lure and a general malicious PDF detection. The presence of a download-related phrase and the ML classifier output strongly suggest a phishing or malware delivery attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/pbw?utm_term=dragon+ball+super+mugen+v2+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418000/normal_60035662254e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5fe1907a678b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450519/normal_6002902351d78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375083/normal_600125e79a413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_60183f8d7ae6b.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
    • http://zikupuzajix.pbworks.com/w/file/fetch/144431571/teamviewer_free_download_15.10.5.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144422916/kafepedubexagegega.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144434205/distinguish_between_formative_and_summative_assessment.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/which_cream_is_best_for_reducing_belly_fat.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/66450337903.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/how_to_consolidate_data_from_multiple_workbooks_in_excel_using_vba.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144423357/engineering_drawing_text_book.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/adobe_creative_cloud_uninstall_command_line.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144435783/the_high_kings_golden_tongue_vk.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422349/what_to_do_if_you_get_a_cease_and_desist_letter.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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 5520 bytes
SHA-256: 5b0dcca7dfe940500605e10aa99c52147e1bbd6757e25e27c1e344513ca2def3
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 10388 bytes
SHA-256: f5d70216d780b6e7f265e30cfd1e842e41a1eb1d30e29e08e46cf8b414025a8c
font_02_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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