Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb7e994794f9279…

MALICIOUS

PDF

91.2 KB Created: 2021-03-26 12:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 235cd92d77e279f5ef4f7613ec8205ab SHA-1: 52aeac80da522e20ebc88c30d907c195e785bd3d SHA-256: bcb7e994794f927970aaf0818851d6f0f7ca40042251cd2581362372da44bf7d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are presented as links to various documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution.

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://jacksth.ru/123?utm_term=wound+management+guidelines+pdf PDF link annotation
    • http://bobatukuxoto.iblogger.org/microsoft_solitaire_app.pdfIn PDF document text
    • http://muvubaziforobe.iblogger.org/top_paid_android_apps_2017.pdfIn PDF document text
    • http://rujakagixawimir.22web.org/basha_telugu_movie_from_utorrent.pdfIn PDF document text
    • http://voicebftyi.com/reset_form_fields_in_angularjsbdfl7.pdfIn PDF document text
    • http://bestcreditcheck.info/wouxun_kg-uv3d_programming_softwarei501i.pdfIn PDF document text
    • http://sugegixojavuro.iblogger.org/balasubramaniam_songs_masstamilan.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/fakumexufuvofowibokowimeg.pdfIn PDF document text
    • http://vashastrahovka24.ru/108408688120l7sw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mavusovemoritev.rf.gd/blood_type_b_positive_diet.pdfIn PDF document text
    • http://gajiwudozu.epizy.com/syeeda_s_song_flute_sheet_music.pdfIn PDF document text
    • http://xoxejafomi.rf.gd/advanced_cardiac_life_support_download.pdfIn PDF document text
    • http://xazopab.epizy.com/39818366812.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/54648752742.pdfIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/circulatory_system_worksheet_grade_5.pdfIn PDF document text
    • http://zoxumatodemake.rf.gd/the_secret_life_of_pets_3_release_date_2022.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/r-51m_bookshelf_speakers_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/85666785142.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_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 5280 bytes
SHA-256: 5229aaebaba741b75fd0ce4b1f2630fbfae74e13608fbfe6e182098bd66b9742
font_01_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 11384 bytes
SHA-256: d40f7f5205822d773c1aef369d2c076c6a84888193ef4e18df8183e8de9bd5ba

Open this report in the interactive analyzer, or submit your own file for analysis.