Malicious PDF — malware analysis report

Static analysis result for SHA-256 1606f3f6ccb6ccc0…

MALICIOUS

PDF

78.0 KB Created: 2021-02-26 19:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3dfa63a9caaf7c64ce2de6d543d0c83d SHA-1: 24a8fbb1a1af4993257e9cb5d0e7ff31caca108f SHA-256: 1606f3f6ccb6ccc062fc7f0860b018f9a148b63455cfe94ce70380e7c4e74987
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=ejercicios+de+verbos+irregulares+en+espa%25C3%25B1ol PDF link annotation
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/8205125.pdfIn PDF document text
    • http://jajifejeda.22web.org/vizio_e701i-a3_main_board.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/fPr7jjS/44177914369.pdfIn PDF document text
    • http://wevepizivato.22web.org/malaguena_guitar_sheet_music.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/nofufol-pijel-togux-levedikajisuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/xazakamugi/fgjhdhe/super_cobra_mustang_for_sale.pdfIn PDF document text
    • http://xebobimifu.22web.org/stock_market_crash_again_2020.pdfIn PDF document text
    • https://bozuluxowefag.weebly.com/uploads/1/3/5/3/135349757/845732.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/ghf9DEM/fiwamefutop.pdfIn PDF document text
    • http://zasoremejoka.iblogger.org/adversity_in_a_sentence_yahoo_answers.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/litizemexog_xegevuf_xatamup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowasabitafal.epizy.com/glass_broken_ringtone.pdfIn PDF document text
    • http://gudagugagazof.rf.gd/98856891380.pdfIn PDF document text
    • http://fotexamaluvim.epizy.com/kingsman_the_golden_circle_full_movie_download_in_hindi_480p_bluray.pdfIn PDF document text
    • http://rowagaparik.rf.gd/agendas_escolares_para_imprimir.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_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 5688 bytes
SHA-256: b72557a71e2a0c1a639929a7ec924807752234a5e8774fc3acc7bb3f49e6fa5b
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 12104 bytes
SHA-256: a78ab257ca354d86c05c94f126a7127a72fbac215e5a83e079f590a704f12beb

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