Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d51bad03e07294…

MALICIOUS

PDF

63.9 KB Created: 2021-06-12 03:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 880409e7c071a3d53a5a41f2d3e1e650 SHA-1: dfeacbd570402dfbda260270f7114df9c9fc1f7e SHA-256: b7d51bad03e07294d4e5b12b8beb95518998fbb4739f30129df6e8069f7042a5
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 0.8600

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://coretry.ru/pbw?utm_term=drive+booster+8.2+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485702/normal_6039c4bc83836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_5fdbe707ba993.pdfIn PDF document text
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/dosotixatezevaj.pdfIn PDF document text
    • https://tedogiji.weebly.com/uploads/1/3/0/7/130775371/satarobateniko_bikixelenigon_dudux.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/b8f51a8.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/1d1801652c47d47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5ff79bab2190b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_600506e5af489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_601b19277ad85.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/sewirubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_602857d5c0959.pdfIn PDF document text
    • https://juderesovabivov.weebly.com/uploads/1/3/4/6/134680251/bakunelotizores-punojobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_60063ef734e3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosajivapesi.pbworks.com/f/30499866391.pdfIn PDF document text
    • http://finebov.pbworks.com/f/dapuruvozomoduxixo.pdfIn PDF document text
    • http://mokakiw.pbworks.com/f/problemas_de_razonamiento_logico_matematico_para_nios_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcb08eb-61c9-4802-ac43-b4f669293970/96545950097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1907da57-aded-4c1c-a2a8-52a9f4afcc78/76981432296.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 4844 bytes
SHA-256: 9879a0a71afd51da7008b39fa419b259c0e227fee2bc15021f13d853010b3312

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