Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee28358290beaba…

MALICIOUS

PDF

76.9 KB Created: 2021-04-29 21:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2d86b5f2ee0ef480a4bab47e3029deb4 SHA-1: 7265f927685e96bd86a6c98fb6fe290c5d214efd SHA-256: 4ee28358290beaba1669a51ed9b382d764d4bea40fd2a3ef18df940fbe5e427c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with at least one, https://botokaw.ru/strik?utm_term=what+is+social+contract+words, appearing to be a phishing lure. The PDF structure also indicates it's part of a link farm on disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=what+is+social+contract+words PDF link annotation
    • http://fastpeysistem.online/bezubaan_ishq_movie_mp4os6b1.pdfIn PDF document text
    • http://rafokiduzemava.iblogger.org/32574301282.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/ravipibumexufulusij.pdfIn PDF document text
    • http://yeswins.space/kutimawotozidagiretnsvj.pdfIn PDF document text
    • https://fixafaren.weebly.com/uploads/1/3/0/7/130738550/181950.pdfIn PDF document text
    • http://xewuxufulizifu.22web.org/xagokeni.pdfIn PDF document text
    • http://jikalananigopun.iblogger.org/poetic_form_abababcc.pdfIn PDF document text
    • http://maletewidulebil.iblogger.org/convertir_de_a_word_con_ocr.pdfIn PDF document text
    • http://carbags.site/gisowunizilimuneragaku03nba.pdfIn PDF document text
    • http://sodaapp.club/letter_of_invitation_to_visit_usa_template1w2sy.pdfIn PDF document text
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/1982354.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/formidable_charles_aznavour_testo_e_traduzione.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujanum.rf.gd/40674597989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79725012-0037-47f5-b62a-81406103680c/77456450176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cfacb3-6d42-4a3d-a600-6504cde385dc/intro_to_linguistics_columbia.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/bluetooth_audio_device_driver_windows_8.1_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b8a007-4a3a-46f1-a4cc-d0dfaca6f283/kuvako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d65e91-41d1-4df7-a6a1-1f3eb5726e61/tl-wr841n_v11_access_point.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/29716045611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0306bb-d02d-4f53-935a-f4e6ea371c4b/xujamejal.pdfIn PDF document text
    • http://faxunarin.epizy.com/kalimba_sheet_music_in_c.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/free_examples_of_cv_templates.pdfIn PDF document text
    • http://ruvatarojamun.rf.gd/aggiornamento_android_7.pdfIn PDF document text
    • http://bunebuka.rf.gd/gujotesaritimukudegud.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/blackbird_beatles_tab_songsterr.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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5132 bytes
SHA-256: 347dd442b8494f1be5902f3f73a9215693c00ff70bbdc8de1595579a3d828fe7
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10356 bytes
SHA-256: dae3dd2fc9ee08b5fa405f2bf24df3ebe91aa524a9a6a93ae0169ce7a867d014