Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6a4dea22fcca09…

MALICIOUS

PDF

62.9 KB Created: 2020-11-26 09:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d93b9d081da434b096f11cdfecf37c9a SHA-1: 92001eda09e7ddb10483cd32fbc9de4acfce7168 SHA-256: 0a6a4dea22fcca090f21c073e71449039ff2985fd38dbb65b46e4c65058cb927
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. Several heuristics, including ClamAV detection and an ML classifier, indicate maliciousness. The primary URL, 'https://trafficel.ru/strik?utm_term=concours+cnrs+2020+interne', is likely used to redirect users to malicious content or phishing sites. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to further exploitation.

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://trafficel.ru/strik?utm_term=concours+cnrs+2020+interne PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467593/normal_5fb6213f5190d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fada6f4c12fd.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/811c5bce137c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5f9f5cf0579f5.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/kaniwote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5f8c025964304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5f8f039fd5a65.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/sakitivezilike.pdfIn PDF document text
    • https://xojoguxivizu.weebly.com/uploads/1/3/4/0/134096407/4b76a8805.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/rulolodapalikuvuv.pdfIn PDF document text
    • https://tefitosuwit.weebly.com/uploads/1/3/4/4/134478986/529376.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/5dd25053-576b-4eeb-9f36-20f04ee4c996/85762425669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeee73b8-1e0e-4ab6-b248-5ea99f416584/nodulamekajijizuwebalokew.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_off0000b060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB060 4732 bytes
SHA-256: a3d18cc06edd47936ffdd103f278259a73eb0919a81905da88ff687264903084
font_01_sfnt_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 9400 bytes
SHA-256: 8216c6ddb6ff310b12f8566c43e27bba1f910b4fa4adad0ff9e670a4cbea1c33
font_02_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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