Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce043b199d95823c…

MALICIOUS

PDF

78.4 KB Created: 2021-02-20 23:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eba5ead91a915ab7f1fd0d12d8333285 SHA-1: c96410369357326c1e9b5711e3943a221a07403f SHA-256: ce043b199d95823c3bbf05e20b5e0244edac4e1f3048556f4b52d93ba9168782
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 hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with a phishing attack designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=which+bread+maker+is+the+best PDF link annotation
    • http://serdyukov.pro/chemistry_textbook_for_class_11lqm5v.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/9f145f.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/laxef.pdfIn PDF document text
    • http://xexogafuko.22web.org/fishing_report_upper_green_river_wyoming.pdfIn PDF document text
    • http://craftsmansmetics.com/totuzinubeizess.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/ljjNhdB/msn_online_games_text_twist_2.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/vigedelabuzega_ronufulepagon_buvubam_fubif.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/kefuzolutir.pdfIn PDF document text
    • http://freud.icu/faulty_parallelism_examples_with_ansl4rjm.pdfIn PDF document text
    • http://getyourscore.info/how_to_learn_photography_for_freejs1tb.pdfIn PDF document text
    • http://jemaxawiju.22web.org/alerta_sismica_df_premium_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazusoketa.epizy.com/cheryl_yung_gravy.pdfIn PDF document text
    • http://vutakeba.epizy.com/65453738076.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/vaaste_song_mr._jatt._com.pdfIn PDF document text
    • http://bexudogi.rf.gd/tintin_2_tamil_dubbed_movie_download_in_tamilrockers.pdfIn PDF document text
    • http://fozidunaleral.rf.gd/nufetusum.pdfIn PDF document text
    • http://wawutanow.epizy.com/wpf_binding_string_format_timespan.pdfIn PDF document text
    • http://pokizepifowuw.epizy.com/close_out_report.pdfIn PDF document text
    • http://folilef.rf.gd/anthrax_exposure_and_awareness_answers.pdfIn PDF document text
    • http://rudufegasavu.rf.gd/fifty_shades_of_freed_full_movie_netflix.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_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 5364 bytes
SHA-256: ec63d80fed963891f5b7cde5068fce4fb6646db9dc4e2c872eedeb97443c56dc
font_01_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 10504 bytes
SHA-256: b2c53d84d2630259bca5778edf10d6abc234d49ee9a7a282e96140924cbdd39b

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