Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b6a702cb15f52e…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 08:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bf2ae8f8e422798f048cd4869ce6e98a SHA-1: df8fbbfb7e92262e404e2bd23d9f57c1fe3a0fb8 SHA-256: 26b6a702cb15f52e93403bf2e37b2a7f6ca5e9cb470cf408c35408347b6f39cc
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating an embedded external URI. The primary malicious URL, 'https://nipisod.ru/wix?keyword=constant+of+proportionality+word+problems+worksheet+7th+grade', is likely used to deliver a payload or conduct phishing. The document's content, though partially obfuscated, suggests a lure related to educational worksheets, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/wix?keyword=constant+of+proportionality+word+problems+worksheet+7th+grade PDF link annotation
    • https://cdn.sqhk.co/madufuxenuw/iijdCMf/como_se_dice_me_vendiste_en_ingles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fecceefa7a3f.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/gfjjzHk/nawegajexuriju.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/zapixebufudigemerida.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/jchh0ja/twisted_metal_black_sweet_tooth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fdf0a360ce93.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/givgfhb/treasures_grammar_practice_book_grade_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5ffcfe2d5980d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5fcc3c28559ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fff6b5983d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fef8f6152d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_60519cb40c488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff7f925d76a9.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/how_do_i_use_my_nesco_pressure_cooker.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/geIngiL/asteroids_meteors_and_comets_differences.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_6016b2f7783ec.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/gekixadonuru/44677159701.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/easy_piano_sheet_music_for_beginners_christmas.pdfIn PDF document text
    • http://vawirir.atwebpages.com/256983036.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/1st_grade_math_worksheets_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/can_you_take_melatonin_with_alcohol_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/kurukshetra_university_distance_education_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/26979790840.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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 5840 bytes
SHA-256: 52fb178b3a4e97ca99771d625fb987e060cdc24e0217033d4a196304323f046b
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 11184 bytes
SHA-256: ffdfe711a8766af75d337be08e56c83add19c9895897c34061d8add91a3ab8dd

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