Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae143673ede6e4b8…

MALICIOUS

PDF

76.8 KB Created: 2021-06-01 17:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2dd5135080635b7c040b32194b00e994 SHA-1: ada06d3eaf896c583cf78cfa4b8f1c675430f838 SHA-256: ae143673ede6e4b8bebea3757412298ab4249ec6ae8573654bff03b8ef43d9f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://huntic.ru/pbw?utm_term=livros+ap%25C3%25B3crifos+da+b%25C3%25ADblia+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5fed3a14a81bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_60526054e36fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_60116ac82f69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fe6ea3b09531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_603f5f459dfee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f854d465-266b-4830-b7a6-5423fc692180/que_es_el_ego_y_como_funciona_en_nuestra_vida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3437e746-4d10-4779-a980-40d791b032dc/89695607881.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/jidugapexibosaxatapoburak.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144450504/mofipulogewazupuleles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84911bd5-e949-4607-88f0-9481705c1b16/7962639478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01946ff-ad1a-4334-b140-b8083b6e34ed/childrens_stories_to_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef2e3ba-401d-412b-b9f6-2e651471cfd3/dujakabalalobepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f6493a-affb-4267-8d7f-8c3c4ca072e8/how_to_download_spotify_songs_without_premium_android.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144415353/accounts_payable_interview_questions_in_wipro.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/pasifivaxoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f238a808-7011-4820-8c87-637a4daafd41/conversion_fracciones_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/seginadodimagokigame.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144422934/dosejajamutebatir.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/what_is_the_best_free_anatomy_app.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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 5480 bytes
SHA-256: 99c3f8597ecd2c111f5850048045b264f9ef79d536129873cd95a70ca927cce6
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 13844 bytes
SHA-256: 9768c1393b22569c4e7bbed4f6d5f53ddfe0646eed164b442f46227b343737e2

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