Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aec41eb0080e83…

MALICIOUS

PDF

78.9 KB Created: 2021-02-23 21:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 79b95b785913b0d950e9534efcb526f4 SHA-1: 2e9311619971c7f91b8472d54456a228c972b871 SHA-256: 99aec41eb0080e835baceeafe5dcb7ce26e3089e39db1f9f0879f3fe883f5d19
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a common phishing or downloader pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=rules+of+playing+chess In PDF document text
    • http://heretythere.site/super_kart_adventure_dashboard4jvg1.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/grammar_worksheets_2nd_grade.pdfIn PDF document text
    • http://wildber.store/how_to_find_starbucks_work_schedulemyyed.pdfIn PDF document text
    • http://itactical.xyz/kumagizidomovuxupoasy.pdfIn PDF document text
    • http://copyrightram.net/material_requirement_planning_downloadoh7fl.pdfIn PDF document text
    • http://sibuvre.com/putekotunenutarexopisonirv3pe9.pdfIn PDF document text
    • http://hocostyle.ru/best_animated_emojis_for_android95924.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/wazotojemov/automated_testing_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/bounce_vs_downy_dryer_sheets.pdfIn PDF document text
    • http://tagowavez.epizy.com/what_are_words_that_start_with_equi.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/mapa_mudo_america.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/hennepin_county_diagnostic_assessment_form.pdfIn PDF document text
    • http://fugewep.rf.gd/ledisi_pieces_of_me_free.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/vidmate_for_pc_full_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/85269557744.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/71016930080.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/weripufafixorew.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/amazon_affiliate_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/android_games_online_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/netflix_logo_animation_after_effects_template.pdfIn PDF document text
    • http://begosene.epizy.com/hopes_and_dreams_trombone_sheet_music.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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5288 bytes
SHA-256: a19332e942d835b4978075ca043216e3d52095646e05566eab7835c2b372f47f
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10504 bytes
SHA-256: 8e64af897e576e0cd223a4c84b1547630cd0e2333f38e1c5a69895e882930b5e

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