Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b8efb637828fec…

MALICIOUS

PDF

73.6 KB Created: 2021-03-26 07:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93c29326496ce546a2e8148d0698e5a7 SHA-1: b14098c5ac53dea2e9c7d91c7a38ce5bfb8e871d SHA-256: b6b8efb637828fec495812e02d98cff989355653bdead2ee61ea93aae602ab5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=audio+from+soundcloud+link
    • http://ridunculus.com/resonance_physics_study_material_free_downloadl7yjr.pdf
    • http://like-store.site/pdf_tkb_guru_agama_islamt0k2l.pdf
    • http://firstsecu-paypal.com/is_model_y_longer_than_model_3q9dd2.pdf
    • http://sunny-web.ru/la_divina_comedia_libro_completo_en_espaolxu1b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_4e5972fd1c3c44aaa0ec40ad7a044f14.pdf?index=true
    • https://s3.amazonaws.com/xezonijida/mufum.pdf
    • https://s3.amazonaws.com/litunux/free_handwriting_practice_sheets_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/99b9d619-41f0-4219-8503-e6a8f04121f0/sullair_185_air_compressor_parts_manual.pdf
    • https://s3.amazonaws.com/wizakokowe/angular_2_template_driven_forms_validation.pdf
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_8b67e6d720ae48ef988c35206dbff4ef.pdf?index=true
    • https://s3.amazonaws.com/patilawasu/best_mackie_pa_speakers.pdf
    • https://s3.amazonaws.com/paxuvagal/letter_i_worksheets_for_kinder.pdf
    • https://s3.amazonaws.com/tutapaxi/vegan_bodybuilding_meal_plan.pdf
    • https://s3.amazonaws.com/furunumaroxun/academs_fury_summary.pdf
    • https://uploads.strikinglycdn.com/files/fe04e92e-e500-4aad-809c-e76913c87475/how_to_change_display_name_on_cisco_ip_phone_7941.pdf
    • https://s3.amazonaws.com/xidulumexi/bokomo_corn_flakes_nutritional_information.pdf
    • https://s3.amazonaws.com/nademopor/tanivinivafojigi.pdf
    • https://s3.amazonaws.com/bokofapig/freelance_consultant_website_template.pdf
    • https://s3.amazonaws.com/wuxupewu/latex_poster_template_a1.pdf
    • https://s3.amazonaws.com/gapivegek/how_to_read_an_ekg_test.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_off0000e20d.bin
58ddcf9dda154159bf7ca997de0dc189c38af76f15a1f56601d48553791a1300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 5012 bytes
font_01_sfnt_off0000f309.bin
2598328d0ed8702a6fe61a066b31310eac7663a6ffa80b5585c6176ca054b025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 11172 bytes

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