Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f584d1e4b81b8…

MALICIOUS

PDF

66.3 KB Created: 2021-02-14 22:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: aade34c44f085495d2cffde2c917ddd7 SHA-1: 6f8fd8d4b2626c179f2e3edbcf7b0ecc3eba3f59 SHA-256: c37f584d1e4b81b8562a18afe26a8cacd3257f9cb329ff0c40b96b5a2312f182
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=cells+and+tissues+packet+answer+key In PDF document text
    • http://milanomoda.site/16449235134ta4lb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fd7b67c3fbb7.pdfIn PDF document text
    • http://cosmicgig.com/made_in_china_2025_reportgb1sk.pdfIn PDF document text
    • http://profaudit32.ru/dinamicas_de_grupo_para_trabajo_en_equipo_y_liderazgo63qx1.pdfIn PDF document text
    • http://submonster.xyz/the_armor_of_god_bible_study_book_bylpmat.pdfIn PDF document text
    • http://kinokaiff.space/egg_drop_project_straws9wya8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_600a28b920ee6.pdfIn PDF document text
    • http://mkr-olimp.info/album_songs_tamil_2017h42u2.pdfIn PDF document text
    • http://mx50off.info/assassin_s_creed_identity_mod_apk_apkrealrypum.pdfIn PDF document text
    • http://jobauthor.online/pezumagnx21.pdfIn PDF document text
    • http://batut.space/27086523491gf9af.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/Tib7Rge/new_york_city_tourist_guide_book.pdfIn PDF document text
    • http://daddytestit.xyz/thinking_fast_and_slow_chapter_summaryq1pul.pdfIn PDF document text
    • http://pixxel.life/xivetomijinexiramfpcuo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fdb67becb6ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 5228 bytes
SHA-256: 0cc1c7bb9419deb2ef1ef547656881f355f753ac10f32e7ed907eb9261802660
font_01_sfnt_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 10108 bytes
SHA-256: 74a95effeeb8875e90c8fd375c665c533ddeb24422594201eeffcd6396d98787