Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1639734d468f26f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-19 02:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a49f873ef4f4875b941ef6514050b73e SHA-1: e09d51f8d33bdaac5ef76ed22116de2d62a7b0b3 SHA-256: d1639734d468f26fb393b28e518c71ee3e8c90a4685bfc81ccbf3f4a2fa6c137
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, indicating a high likelihood of malicious intent. An external URI pointing to 'jacksth.ru' was extracted, suggesting the document's purpose is to redirect users to a potentially harmful website. The embedded content appears to be obfuscated or corrupted, preventing a deeper analysis of its specific function beyond the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?utm_term=what+is+meant+by+the+statement+resources+are+scarce PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fd3dc0b03935.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_60068794388d3.pdfIn PDF document text
    • http://ximikilanad.22web.org/game_beach_head_2000_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_601a3bd39e54e.pdfIn PDF document text
    • http://vewazovowev.iblogger.org/10633407062.pdfIn PDF document text
    • http://sarhello.online/pokemon_black_2_nds_rom_zip67dkj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_6015a32891da3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lerezazo/bajrangbali_ki_photo_karne_wala.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/85029272818.pdfIn PDF document text
    • http://riberudedanute.epizy.com/lagodobawubekenofibomuzo.pdfIn PDF document text
    • http://doxekapop.rf.gd/conjunctions_worksheet_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/antivirus_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/sociology_optional_syllabus_2018.pdfIn PDF document text
    • http://lexojowal.epizy.com/laravel_ajax_form_autocomplete.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/target_fieldcrest_sheets_full.pdfIn PDF document text
    • http://sodebaxekigefip.rf.gd/the_gadfly_suite_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/pan_card_application_form_2019_new.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/senem.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5264 bytes
SHA-256: 6793b557d33de0dd862b37d231d3afb9b04f5c77cc2f62d035694a5337d86fa8
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 10868 bytes
SHA-256: 07a8801b884927a9d381418384e84be5635581f6986585c9c82f504a5fcd76a7

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