Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5344d1d0c19987…

MALICIOUS

PDF

73.5 KB Created: 2021-05-04 15:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 02eb9efcf74fb8408cf8a32c9cdc4705 SHA-1: 9f3fc399a3b8d3f4650749b0fc91832be00f5655 SHA-256: bf5344d1d0c19987b5696152122983367bf66f646c5c5e7f6cb6ff1bf87241ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=libro+cuando+lo+que+dios+hace+no+tiene+sentido+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414169/normal_604925cb5a346.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/seta_bursary_2020_application.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/dhchgfH/87597335603.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/m4qhgi7/vhs_video_player_hdmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_6024224d4b5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_6068a15a0eff8.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/mechanical_properties_of_alloy_steel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_604845fb35cd7.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/descargar_el_barril_de_amontillado.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/ijjeqjd/baixar_aplicativo_playtube_video_tube.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/77415714663.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/alienated_book.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.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/toliwudalamem/telugu_dubbed_movies_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44080107-2841-4a87-81d5-65bdb830c839/48304539473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e3e80c-3f89-49cd-bb18-847eff10ae5c/how_to_develop_good_time_management_skills_a_medical_assistant_should.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69827eb9-39e2-4627-a627-40a112b1902b/dukederuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d604f86b-559b-4b25-877c-cb8787c00b84/60138770202.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/grade_3_math_measurement_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f043f0-212d-4c79-b715-f6d68f5ff62f/gosatujinoveg.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/caged_chord_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/5705951649.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/79782062055.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/the_art_of_racing_in_the_rain_original_book_cover.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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 5448 bytes
SHA-256: e5194df4254d16e2cd6939291239c47c75a3ba2a4c20f883e7a23d6741b45a2b
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 12420 bytes
SHA-256: 65c069bf64f3de2fc3826b6db03b697f1637d68bcae11fc2a8471ccc6c733f64

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