Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e849c745113144…

MALICIOUS

PDF

86.6 KB Created: 2021-03-04 07:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f3adcf445ffb51f31684b697737f159 SHA-1: 06a9457b2b209a9a503064a8b2ad15e2097c3e52 SHA-256: b4e849c74511314488406a89ceeb0a0fd26652610ff78db6c1b3c2ec86b22620
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/wix?keyword=kill+bill+the+whole+bloody+affair+parents+guide PDF link annotation
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/rolasuxefubire_wuweninezusuru.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/p5f9jiJ/dual_enrollment_courses_georgia.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/how_to_change_nc_license_plate.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/renobig.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/xafobixeduteradakavunaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_600e43a5e5c1b.pdfIn PDF document text
    • http://maslovauto.ru/why_isnt_my_internet_working_on_my_samsung_tvwiyph.pdfIn PDF document text
    • https://cdn.sqhk.co/pometobab/ejevyjg/bcg_model_youtube.pdfIn PDF document text
    • http://kushtanash.ru/3082752568pg06h.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/mexag_bigenubupi_lolemedu.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/arris_tg862_reset_button.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/gcrjbWj/duet_songs_karaoke_opm.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/3dba9f2e028f70.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_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 5608 bytes
SHA-256: 4c27e4b6ae2e73176b6a33213d8a3f3a6f8f6e73a26ccf322a3441ead3868240
font_01_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 11988 bytes
SHA-256: 1cd83d99d1de41b34a8b7c12c1fa7702be40a031312f860698aa0bb7a8eba289

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