Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a82ba1bd5951e2…

MALICIOUS

PDF

66.3 KB Created: 2021-02-16 12:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 9b8ed5984681c36333aa3d38a0024a98 SHA-1: 29d8fcaef82e1ae4d111058183a6e2c148b72f60 SHA-256: 21a82ba1bd5951e2730181e89f62215a9d4bffa106fdbeb2e0a175ba2616e1ed
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/wb?keyword=list%20survival%20minecraft%20pe%20servers In PDF document text
    • http://mihetos.xyz/mixed_present_tenses_exercises_intermediatezsj3g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_602b854d6733b.pdfIn PDF document text
    • http://reweder.site/my_favorite_things_sheet_music_pianoa9ima.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/jas1nfQ/cytus_2_apk_data_revdl.pdfIn PDF document text
    • http://wobixoka.66ghz.com/58679453227.pdfIn PDF document text
    • http://ziponep.22web.org/falatunajejebalesufofawem.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hd951jh/6120411931.pdfIn PDF document text
    • http://hr-insider.com/xiraxi85j2x.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/haDjiU9/tugijuw.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/ejfPid8/lalovazuwugepivut.pdfIn PDF document text
    • http://feedbacrnz.space/ischemic_stroke_guideline_2019m2z3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefokezutuvij.epizy.com/pdf_to_dwg_converter_free_filehippo.pdfIn PDF document text
    • http://wefasinufatotag.epizy.com/zorovele.pdfIn PDF document text
    • http://lozepis.epizy.com/mariana_mazzucato.pdfIn PDF document text
    • http://tuxugev.epizy.com/hannah_montana_butterfly_fly_away_song.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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 5160 bytes
SHA-256: f8d2b1ad0d7999b7f38e3860e88003daf1400de042eb91badee795bc27d2dfde
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 10160 bytes
SHA-256: 9ddc69c1d1e0aa82c565cf422a3f844ada2c63ef7ea4bfe15f2b814e6e57dd38