Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3835c374b03bf53…

MALICIOUS

PDF

80.1 KB Created: 2021-04-24 11:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 912f15a6173919fe67c595d61b0e3e5c SHA-1: 265d9064d550493a70391c665c2556f4dfd05f65 SHA-256: e3835c374b03bf53c3cbd495f86e5ae0dde360573787155574aa959d9ae03adb
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely intended for phishing or malware distribution. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to combining files in Foxit Reader, suggesting a social engineering pretext to drive users to the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=how+do+i+combine+files+in+foxit+reader PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475741/normal_6004dae747ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_604fc825bd058.pdfIn PDF document text
    • http://gatigade.iblogger.org/freak_on_a_leash_drum_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_6023d762c1068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_606a62f77c8d3.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/medical_laboratory_manual.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/bejexe/two_step_equations_with_fractions_and_decimals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/common_core_math_worksheets_6th_grade_ratios.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/bully_english_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/who_owns_the_ice_house_chapter_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/gabiwufarejumozofi.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/xazuruvupi.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/merry_christmas_everybody_sheet_music_free.pdfIn PDF document text
    • http://sasunuvelew.epizy.com/chess_learning_books.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/54225286831.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/tudus.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/medepunokafe.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/pronoun_practice_worksheets_for_class_2.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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 5428 bytes
SHA-256: acc344de0c5b4bde7c7b6b80aab1cc5a5b07315c6a08d73a5066d1dc40505d73
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 11984 bytes
SHA-256: 89bc6aadd9caacb0d23f5974611c91eb9a9de9118508dea4481e48511e56105a

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