Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcff17b3d359368…

MALICIOUS

PDF

78.8 KB Created: 2021-03-09 17:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f9879f614a8dbdb19ef3866a6003948 SHA-1: d483dfb6e3b4155622e40ed1c18b17271db974b6 SHA-256: 3dcff17b3d3593680e05b002ace1654c786a2b7c1d2cd885d5a39ee13ed1ed20
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains embedded URLs, including one pointing to 'midufefew.ru', which is likely used to host a malicious payload or redirect to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm on disposable hosting, further indicating malicious intent.

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://midufefew.ru/123?utm_term=fusionner+plusieurs+document+pdf+en+un+seul PDF link annotation
    • https://cdn.sqhk.co/zanemulazif/hNje9Df/stickman_basketball_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/hhaifAl/63382139770.pdfIn PDF document text
    • http://selizixid.iblogger.org/17458563764.pdfIn PDF document text
    • https://cdn.sqhk.co/degamuwubela/hfgjgjk/app_assistant_huawei_nova_5t_apk.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/how_much_does_it_cost_to_get_a_harley_service.pdfIn PDF document text
    • https://cdn.sqhk.co/kutisetu/fSidhak/honeywell_t4_thermostat_manual.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/que_es_un_estilo_de_vida_saludable_brainly.pdfIn PDF document text
    • http://wipujugewubesu.iblogger.org/lunemawozotejowijot.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/short_book_review_of_hamlet.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/gdKhbYy/snake_and_block_primary_games.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/how_to_find_the_limits_of_a_piecewise_function_graphically.pdfIn PDF document text
    • http://sibixujuw.22web.org/small_bowel_bacterial_overgrowth_treatment_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/how_to_program_a_ge_universal_remote_to_a_orion_tv.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/57225851014.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/articles_exercises_text.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/sig_p229_holster_owb_leather.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/babupixixopezizaxaf.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/best_english_to_spanish_translation_online.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_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 5048 bytes
SHA-256: f668f2dec2c1fa119649cadd1dc031402ce624862ba291c952ad5cd5c99b0025
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 10964 bytes
SHA-256: ded4002a45ea8f4a7647a1fdc71f93618b9d35a781d1ef6677a663a4928a9e59

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