Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c1f9ea71bc6cfc…

MALICIOUS

PDF

77.0 KB Created: 2021-03-21 05:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e79edabb1b7f08ec4e7ab8ce422427a9 SHA-1: 51a15e64969fdc716300751d9231ca2c0fa80566 SHA-256: 36c1f9ea71bc6cfc37de0972a6dd571a58161349a89ce57fa5ed409e506a1998
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=peter+pan+pdf+em+ingles
    • http://figejewumoposes.getenjoyment.net/deep_learning_drive.pdf
    • http://wejesigozolireb.getenjoyment.net/pdf_to_word_converter_edit_text.pdf
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/3582978.pdf
    • https://dukuvelawabuze.weebly.com/uploads/1/3/0/9/130969723/8323603.pdf
    • http://lazategomid.scienceontheweb.net/cable_tray_installation_guidelines.pdf
    • http://melofuwi.getenjoyment.net/tenevomuzaposopajos.pdf
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/af0476a0.pdf
    • http://zanexipizuzog.iblogger.org/tebimesuneguvatu.pdf
    • http://povisowalikim.scienceontheweb.net/dewalt_miter_saw_12_inch_manual.pdf
    • http://godezigupo.mywebcommunity.org/classroom_language_exercises.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6a272a8-ebec-49ef-a985-70fd810966bd/ziwurumedojizufuk.pdf
    • http://wodasakuzetu.rf.gd/mubudumuwivabalemosow.pdf
    • http://tadezaxe.rf.gd/nabew.pdf
    • https://uploads.strikinglycdn.com/files/4033c05d-fda4-4830-9899-875b3b504aa3/bose_wave_radio_remote_battery_size.pdf
    • https://uploads.strikinglycdn.com/files/6be6288d-3af1-46d4-b23e-3c7494d53c37/how_to_reset_sansui_tv_remote.pdf
    • https://uploads.strikinglycdn.com/files/a733a273-e0d7-4272-92b3-10d4b204bd21/how_high_will_a_cat_jump_from.pdf
    • https://uploads.strikinglycdn.com/files/004fa2d7-0b09-4565-9d3b-7231714cf75a/welcome_to_holland_poem_part_3.pdf
    • http://jumepenitujox.atwebpages.com/tegada.pdf
    • https://uploads.strikinglycdn.com/files/ea9cfd0f-fb7f-4cbc-b604-6c5840dfe17d/reset_low_toner_brother_hl-2270dw.pdf
    • http://famifel.rf.gd/zevedabijake.pdf
    • http://fuwotimusajitos.rf.gd/45986270061.pdf
    • https://uploads.strikinglycdn.com/files/334028da-1d93-476d-a568-caabed45a94e/15247415681.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecf.bin
4e076915b1c462fe3db0264f07657c9a1db70b5fb52ac9504bb3be7c482c37da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5360 bytes
font_01_sfnt_off000100f6.bin
ae5f581f29e4d92f55bc9b10b7857ff637219d4d0de1639e25ca2e4bd893b11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 12288 bytes

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