Malicious PDF — malware analysis report

Static analysis result for SHA-256 77559b1f3c92c0f0…

MALICIOUS

PDF

67.6 KB Created: 2021-04-06 19:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 450975c8a2d1b179270484e4f583dd89 SHA-1: b76b2e0271d655438be2d70b2c84daaa7e85d010 SHA-256: 77559b1f3c92c0f05ea15c588de90451aecb4df05d22fd76bca7fcbf6e2b4088
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 0.8455

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://vilenefex.ru/aws?utm_term=who+owns+the+federal+reserve PDF link annotation
    • https://nixulate.weebly.com/uploads/1/3/3/9/133999199/9a9b3.pdfIn PDF document text
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/wegig.pdfIn PDF document text
    • https://gunanase.weebly.com/uploads/1/3/4/4/134488627/kiduziduv-vonoke-warufagada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_6039d530a4c0f.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/20806276106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457305/normal_5fef53de3de06.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/zebinorawutax_xusatonepaka_jonokebo.pdfIn PDF document text
    • https://venowogofopow.weebly.com/uploads/1/3/4/6/134611371/dagamav.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/magic_treehouse_book_series_reading_level.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_b563fe7c741d4320bb401f1976bf5757.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/81213005459.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_62ac1eac15e04ef398bc58c154ca51a0.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_d962e2775f024ea896689be81f1a8823.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_e162c4a3aa674e6eb620bdc5bbacec15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/buscar_por_foto_desde_android.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_701b7d65dc5f4697b6afe03353fd82ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzakob/xenodesilobiviw.pdfIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_c55a40ff3d9c44b098e7a43af2d36b36.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_d0abaec9f71141a6a9fe2d833c56f618.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_c26ab0be48b041ddb54588efccdcb726.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_f3dcf75fc35a4e7a9b61e36d020aee3b.pdf?index=trueIn 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_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 5160 bytes
SHA-256: 3b4d08a7f06dc0707c867fa0075846dd0e6fda2f298b05a218c031dc8c9c6c74

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