Malicious PDF — malware analysis report

Static analysis result for SHA-256 635a33390478bb7a…

MALICIOUS

PDF

51.7 KB Created: 2021-04-04 18:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 54c67d8717c8f8e02ada83bfb490db50 SHA-1: 7e86597c0a140366f595fb868858d41808ce1b52 SHA-256: 635a33390478bb7ab7775cff3f4f19ab8ce801a86df415479faf63191894b9fe
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 0.7523

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=business+enquiry+letter+format+pdf PDF link annotation
    • https://katatowuli.weebly.com/uploads/1/3/4/8/134879603/dogoz.pdfIn PDF document text
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/6817841.pdfIn PDF document text
    • https://lugivizukur.weebly.com/uploads/1/3/1/8/131871894/1172331.pdfIn PDF document text
    • https://gufogejerujog.weebly.com/uploads/1/3/1/4/131406717/reboxesuxolupozeg.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/405777.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/b550dd290da1e.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/lofux-mijasopasumo-noduxupesize-vanimoviwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_601dd0f1a5392.pdfIn PDF document text
    • https://wemuwenaxi.weebly.com/uploads/1/3/5/2/135298044/fb772a77.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/zoxamevil.pdfIn PDF document text
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/jegileledasaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_602b9471a3490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_5fcef0601a6e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fed08e7910ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_60267e9e33068.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/a7bab7.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/lenasemazanegalepis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5fd2cb153ec6a.pdfIn PDF document text
    • https://simixoko.weebly.com/uploads/1/3/4/8/134867908/67bd571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6041c1e09abcf.pdfIn PDF document text
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/1970875.pdfIn PDF document text

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