Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a390a299d7c721e…

MALICIOUS

PDF

65.1 KB Created: 2021-06-09 12:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9ba557a51499497f0928f51ce1e902b SHA-1: e811a092757d5383c86221cce26bba77e21ed6d8 SHA-256: 8a390a299d7c721ed3210b569844b13499c105cd6b8caa7ec9db5143ad7426c3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.8429

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.
  • 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
  • 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://medvor.ru/pbw?utm_term=founding+brothers+ellis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489983/normal_600022430d44d.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/6301727.pdfIn PDF document text
    • https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/ruduwikamudiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5feafd88b9d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fe971803d656.pdfIn PDF document text
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/1619962.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/wazebijudorote.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/tebilanupigux_degadiwiduloru.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/fa4d18.pdfIn PDF document text
    • https://zikakivoso.weebly.com/uploads/1/3/4/6/134600150/kebuxoponik_xotofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_606ea3a50ece7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426418/normal_60b6925319878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fe607a192b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_606bcbbaebdcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_605964c6eee13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/712281d5-3425-4afb-8c44-6492fcf8a4fb/ingenuity_automatic_bouncer_not_bouncing.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144777624/regresin_no_lineal_ejemplos.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3549ed-ec74-4070-84bc-bd1dfe16e0b5/bosch_500_series_dryer_cleaning.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144839700/tariluwugarifofuxefo.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 5072 bytes
SHA-256: 7470991177cf8baa90b0147df25296d219f7b062c1d88fa1c080c53139105658

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