Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bd37ea80a79da7…

MALICIOUS

PDF

71.6 KB Created: 2021-06-11 18:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: aeb75884380326eea0c52e7882fc925d SHA-1: 591ead7a57cd7ba83bcd13500a423275bcf4b74c SHA-256: 51bd37ea80a79da74e4c1e82dd1cb8c2969052ad6bfd050788f270a79989b01b
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 flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains and using UTM parameters, suggesting a phishing or link-farming campaign. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

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
  • 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://chcial.ru/pbw?utm_term=rita+book+pmp+pdf PDF link annotation
    • https://jizirazizeki.weebly.com/uploads/1/3/4/5/134509590/2880169.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/3481590.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/eaad9bdd586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_601816301ee5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_60327f0c185b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_60226239e90fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_604f47c6ef3c6.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/kadop.pdfIn PDF document text
    • https://votewisuzub.weebly.com/uploads/1/3/4/6/134605747/6ab3f7f74d1a.pdfIn PDF document text
    • https://geduwitanezuter.weebly.com/uploads/1/3/0/7/130738684/soredakuloje-zexedepijufawof-tikukik-xevadum.pdfIn PDF document text
    • https://fejuratomejavud.weebly.com/uploads/1/3/0/7/130776174/a65a12e53371b3.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/3964776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411480/normal_5fcb78bca5f1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_5fecd2226481c.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/rejojixaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midevodimu.pbworks.com/f/rubberhose_free_download_mac.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144508494/skins_para_slendytubbies_3_piernas.pdfIn PDF document text
    • http://figinav.pbworks.com/f/baldis_basics_game_download_apk.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 5092 bytes
SHA-256: 098d344aa1369c9fb1ca5134ecd3464fccb3149b35cde6a3d67b6de8a38769fe
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 12760 bytes
SHA-256: a30a517925151bc7a4894263f32b2911535b3c434242a23f6fc1612e548d3633

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