Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fccd8d60e9aa60d…

MALICIOUS

PDF

69.7 KB Created: 2021-04-25 14:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 065506c2e02a500a11989a4e25a71df9 SHA-1: 5e783a72e1cadc57869a01c6db0e361f8cb8d020 SHA-256: 9fccd8d60e9aa60d2a38e0d6bbb4864e09ab3f1cb2b0153b5ead1c77c67c8ab5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to educational materials, directing users to external sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=fundamentals+of+differential+equations+and+boundary+value+problems+7th+edition+solutions PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/dikeregibexoribaxurozipoj.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/catering_company_profiles.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/albinus_on_anatomy.pdfIn PDF document text
    • http://kekasot.22web.org/florida_general_warranty_deed_form_free.pdfIn PDF document text
    • http://xazusifiwo.iblogger.org/how_to_use_smart_bp_hr_bracelet.pdfIn PDF document text
    • http://ighelpcenter.xyz/batevazusukopixafegh35n9.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/mcp61pm-hm_rev_2.2_bios_download.pdfIn PDF document text
    • http://kofugefosuziwib.22web.org/upsc_blank_answer_sheet_format.pdfIn PDF document text
    • http://damvglaz1.xyz/833333529928gc6g.pdfIn PDF document text
    • http://mivetys.xyz/20577347061q40e2.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/what_do_you_do_at_a_orientation.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/basic_spoken_english_course_syllabus.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/renfe_rodalies_horaris_r4.pdfIn PDF document text
    • http://momentshop.website/jquery_validation_stop_form_submitwlozp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8659a18c-4501-4a24-a9f7-bab9f5cf999c/how_to_do_dbt_individual_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66c2722-62d5-444c-a7d0-61d7f9ceacea/how_to_install_britax_frontier_as_booster.pdfIn PDF document text
    • http://dejanubotikepiw.rf.gd/xezisopaxaxefujigitixoze.pdfIn PDF document text
    • http://nareboveridur.epizy.com/hallelujah_guitar_chords_sheet_music.pdfIn PDF document text
    • http://solejow.myartsonline.com/tabla_de_calibres_de_lamina_galvanizada.pdfIn PDF document text
    • http://sirusuve.epizy.com/broiler_poultry_farming_book.pdfIn PDF document text
    • http://xozodijavoxovun.epizy.com/how_to_improve_your_vocabulary_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a13cf4-652b-4df5-b150-9ae90acfdfd8/48122475799.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_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 5744 bytes
SHA-256: 666654377c0c0aff1ebcf7f7f41b5b14a00f66ffe83787819c6abfc6af1fb0f3
font_01_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 9756 bytes
SHA-256: 9b1f7118116152c4afec5c3a3199c767699b5536f98388b080edd2f71151820d

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