Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e090b9c9bc169eb…

MALICIOUS

PDF

73.4 KB Created: 2021-06-08 20:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7ece419973bf7c1f3c6802febf147569 SHA-1: 1e4fe58ce4a32358350712777f1cbb04a7abf548 SHA-256: 5e090b9c9bc169ebe12f72e7a6dfe9f8d36f3ef2f2ea4be22a67485b9799907d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous external links, with a primary focus on directing users to 'crewmak.ru', likely to deliver a secondary stage. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to execute malicious code or facilitate the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://crewmak.ru/pbw?utm_term=telecom+protocol+testing+material+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476750/normal_6052b982cdaec.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/suxedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5ff86a704807a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409607/normal_6007d4e05499f.pdfIn PDF document text
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/7297002.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/8beab.pdfIn PDF document text
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/penor_belimarewe.pdfIn PDF document text
    • https://lotekovikerux.weebly.com/uploads/1/3/1/3/131398560/b2d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fe86c6787a82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_5ffe96e84c502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_603822a576f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_6044cdc3de6a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumedew.pbworks.com/f/jexotozetovofowugudigeba.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144505989/41580347975.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144503424/the_mortal_instruments_city_of_ashes_full_movie_watch_online_free.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144420741/exercicios_termos_integrantes_da_orao.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144878592/xatikab.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/6174678421.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144884097/lizoniwiwolo.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144650811/august_current_affairs_2019_in_hindi_adda247.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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 5424 bytes
SHA-256: 1304d74e2811b5f89355673a6509554979b302bf676590a10684905e093192aa
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 11036 bytes
SHA-256: d6c7a1d40878d43b968bcc2843d69ddeb3a29d5ed9fa8cf9042c74e613d22767

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