Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a3fb759c81dd06…

MALICIOUS

PDF

78.2 KB Created: 2021-02-15 02:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5736ebbf2eed9b181bd6cfd54e4c06f4 SHA-1: a92476f052c3c05e56553bfb436ef2118b68ff89 SHA-256: c0a3fb759c81dd0644dd44936e29b97fce97fb380f5a3978d87ef28d92866cc8
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/wix?keyword=antler+farms+wheatgrass PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489595/normal_60295658adafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388067/normal_5ffef8bd5a3fe.pdfIn PDF document text
    • http://lovelyhouse.online/5563524114x212u.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/1c25719b898.pdfIn PDF document text
    • http://mail-autoscout24.net/safonixafoposipuvukyi773.pdfIn PDF document text
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/jujeg.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/poxisetevibow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_601f868741b44.pdfIn PDF document text
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/7828761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449422/normal_5febf6684e408.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/sukumifa.pdfIn PDF document text
    • https://xaweworamek.weebly.com/uploads/1/3/4/6/134610398/temexevu.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/zunozi-mujedetak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/kujafozipovubi.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/95795025130.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/ximoralodona.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/basketball_diaries_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/xidigisi.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5260 bytes
SHA-256: b6dc4c04a28f226ee37af4483ff47af854c7347feb22b94c0846e7656d68d94d
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 10620 bytes
SHA-256: c900bdc4fd7508deb44c6e00114c83db018dc26fc0a391d6a4b4a858d0295705

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