Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd08c25d3be37c64…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 05:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 586995d2f52572979956709440f3d81d SHA-1: 1deaa85c7eb5b0a9b6c001c187b4047ca9759ce2 SHA-256: dd08c25d3be37c6474e6d0303e592c1f41ba9a053aec9371f71ac4bfca38d85a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=painting+ideas+aesthetic+easy PDF link annotation
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/1514662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fc59eda4f397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fccb00a983dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_6041eec07aae2.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/9092930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5fcd52078c2a7.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/dibujarte_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_6037a7a184f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_5fda93b8a9a8d.pdfIn PDF document text
    • https://mobiduretul.weebly.com/uploads/1/3/4/6/134681609/nujamapujovopupewufi.pdfIn PDF document text
    • https://pemopuxurumolu.weebly.com/uploads/1/3/2/6/132681293/jotikurafew_vamololejogeled_texeneg_juduwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482406/normal_5fe1b52656737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fe039264473d.pdfIn PDF document text
    • http://fagawozuwa.22web.org/bienestar_social.pdfIn PDF document text
    • https://doxugibako.weebly.com/uploads/1/3/0/7/130776338/joxowapapu-musekina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_6021a6a3b2b03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xurosuforudev.atwebpages.com/comfort_glow_kerosene_heater.pdfIn PDF document text
    • http://wepukuxazej.rf.gd/the_creature_from_jekyll_island_griffin.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/jungian_archetypes_book.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_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5176 bytes
SHA-256: e0b098d99d59301413ab00aff37fba3764bffbc07e55ce8f51a80f40cbe680d9
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 10492 bytes
SHA-256: 4d22e7502cf1cb3ce407733783f2936deb02fef301d202fa086faa6b70bc6979

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