Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af7dfee5ba51d38…

MALICIOUS

PDF

73.2 KB Created: 2021-02-15 20:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1d14c070ef654786697a598bc33be4b5 SHA-1: 6dbf9c09c3734a087e62a3543b432bb9f7d718eb SHA-256: 9af7dfee5ba51d38f85bdbbdc11935be17eed74d78223f597d73846f15869687
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate this PDF is a link farm designed to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://baarspo.ru/wb?keyword=ap%20style%20numbers%20over%2010 PDF link annotation
    • http://blancop.xyz/company_profile_prudential_indonesiagtkp1.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/jhpjbLG/mnemonist_memory_and_brain_training_center.pdfIn PDF document text
    • http://kittyplay.online/atoms_and_molecules_worksheet_middle_school1i4ry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_5fe25aa4e5a7b.pdfIn PDF document text
    • http://fabulouss.space/bekisunerilerogikuiwiht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_601f4382becf6.pdfIn PDF document text
    • http://digitalmedialit.com/jiwigefenoxanesumetivifiztjg3i.pdfIn PDF document text
    • http://robertferrell.net/manual_de_aplicao_das_barras_de_ack38mh.pdfIn PDF document text
    • http://hesap-al-sat.com/gagizubiko063hb.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/5ggJjij/history_vault_channel.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/jfepjca/multiplayer_driving_simulator_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/jiuwEia/41440406269.pdfIn PDF document text
    • http://tamakar.tech/64394176826vo7sv.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/hiQQZ3T/monkey_jungle_run_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/5KJDszq/how_to_draw_anime_hair_on_procreate.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/4NnOxgf/hollywood_box_office_2020_worldwide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geraromu/2673257153.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/barcode_scanner_google_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/vodoginutibosevujemapu.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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 5240 bytes
SHA-256: dfee14fcb004468aee463bce8250971310fd17e273a4d85dfb7b1299040ac811
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 10900 bytes
SHA-256: 1d2ae3accf98346d3c3d4af54fc9b0a9ffd04595ee4d02619c85f40b92483733

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