Malicious PDF — malware analysis report

Static analysis result for SHA-256 038f007f4dd9ed92…

MALICIOUS

PDF

71.9 KB Created: 2020-11-17 20:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e430fc9399e3cbca1ea982f625cef38f SHA-1: 66a928dfac3331ccb8c26175ecf5497a7f2c1a51 SHA-256: 038f007f4dd9ed924cf77a14ef7f266f4c7ba7fcf6b6e9d5eb245a0a4dee13a9
186 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 0.9997

Heuristics 6

  • 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.
  • 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://traffine.ru/123?utm_term=japan+literacy+rate+male+and+female+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5faa8536b6a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f8a1f495637b.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/kubefugonin.pdfIn PDF document text
    • https://rovivivaju.weebly.com/uploads/1/3/4/3/134313680/lekamubezene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f9cc90ee1cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f8bb3e1e1a1a.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/19127d7bd8b.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/1391114.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/gogikik.pdfIn PDF document text
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/zamojesawugux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9ca3bc5c-a0a9-4154-92ed-bfbfc7181462/67417434852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c6e075-1e6b-436b-8e19-480cfa9858f6/jodezunuzetebinamak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 5376 bytes
SHA-256: f0daef02a1d365bc0f7f2923ced8f5641b69b7f9fef9ac440ae008c0baeaef9a
font_01_sfnt_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 11344 bytes
SHA-256: a73a3787230810f8d3604e3b0bf1c5a2635936b37a0ad8a1f7c5447932017db6
font_02_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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