Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7eac91f588f066…

MALICIOUS

PDF

64.0 KB Created: 2021-03-20 04:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ff27cfa3a7a666f5452e2b82a262dc SHA-1: fab954409ddca04493a97368426eee70986e4c62 SHA-256: 1d7eac91f588f06671f3db9a8d90b8d351341985ce2dc850d1532f4bfebb1ee0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=velan+globe+valve+pdf
    • https://cdn.sqhk.co/duxadikoti/gHG0Dic/sausage_party_slot_game.pdf
    • https://cdn.sqhk.co/vafodagusun/dqraJge/top_free_ringtones_for_android.pdf
    • https://cdn.sqhk.co/felibepudu/B7TXLgd/new_york_hotel_booking_tips.pdf
    • https://cdn.sqhk.co/kugefiruxat/ifjeE2K/my_little_unicorn_runner_3d_2.pdf
    • https://cdn.sqhk.co/jopubelo/hjZgdjh/89201487327.pdf
    • https://cdn.sqhk.co/xolofiwano/hfgdxTS/recargas_claro_desde_usa_a_el_salvador.pdf
    • https://cdn.sqhk.co/foxenikap/pjdzijX/moon_patrol_arcade_art.pdf
    • https://cdn.sqhk.co/vumojakizaw/hcrWZha/sonnys_restaurant_buchanan_mi.pdf
    • https://cdn.sqhk.co/gedugari/jj1DhfA/84023945826.pdf
    • https://cdn.sqhk.co/disegivoji/TsjfYbF/30016910661.pdf
    • https://cdn.sqhk.co/fiseguvugele/qZRysih/dc_comics_movies_release_dates.pdf
    • https://cdn.sqhk.co/xadakede/ihgFghi/diaphragmatic_breathing_for_anxiety_youtube.pdf
    • https://cdn.sqhk.co/nobixapo/gL7FIgh/how_to_max_out_shooting_badges_2k21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d9af80e-0314-4e80-881f-4feb238f72fd/breakthrough_rapid_reading_free.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_e1bb7bd798064af0901d8c2f95152ffb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e0f99ac-4d36-4775-8bbb-6b5074567f69/54847279659.pdf
    • https://uploads.strikinglycdn.com/files/15367553-dd91-4f32-be7d-6d8fa102f2cf/99694549550.pdf
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_56ad061d44b144d58e35e5352c05988c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a1833d86-089a-4c38-b870-c0a3a3eacb3c/37178195988.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e0.bin
068f46b181a7a1f1bfdb9ecb63dd52ffd564c5d193851eda95223dbd5839ec3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 5100 bytes
font_01_sfnt_off0000d65e.bin
eb1052547c8ebee73f61c2b54cbdb51b40c0f2415143cc78909aa72d36387e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 9720 bytes

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