Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d2f55e0cdd566d…

MALICIOUS

PDF

67.3 KB Created: 2021-06-13 06:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f5a4df6e44b1a3054965e8b0d17eb380 SHA-1: 66fe474798f85f38fb8c964920520d287276c91d SHA-256: c4d2f55e0cdd566dd3623cbd9235507cb2b2c6a9331f934b9e3437530ebba88e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/pbw?utm_term=pg+z+gundam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fe0a6f1e0767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fcc2cc7a3f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_600fa6fe909b2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478131/normal_60b2c51c68a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_605c269472c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_606213e186577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_603497ce85ed2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370785/normal_5ff9a52133d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5fc9980b533b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_6054bbeb86f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_6057d1497405b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fcff465afae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_60297cbe2da90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_60baaec765b67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_5febf22a3b82b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_60c4945338c96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezeliv.pbworks.com/f/viveputel.pdfIn PDF document text
    • http://bavudexote.pbworks.com/w/file/fetch/144747174/los_mejores_sitios_para_descargar_peliculas_con_utorrent.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144597045/bijiwonukov.pdfIn PDF document text
    • http://xumamiz.pbworks.com/f/descargar_3_veces_tu_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/sql_server_tutorial_download.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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 4888 bytes
SHA-256: 8cdbafb56660e46f21831a0dd51c914edd13a9cb871b6d31d327c3965a4caef4
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10544 bytes
SHA-256: f730ce273e442f4b0ea27678451411c503efc0ded4360191f8e0ec51bbc3ce87

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