Malicious PDF — malware analysis report

Static analysis result for SHA-256 4566d5751868ac3f…

MALICIOUS

PDF

67.7 KB Created: 2021-02-22 02:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b1614618c48923abd414476a26da850e SHA-1: a5f6e55beca595819ffefeac03e34f1abde81ad5 SHA-256: 4566d5751868ac3f5e67da1fc4e46cc5edc27e658c004378aab64f9fc086a043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to domains that appear to be part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://druttle.ru/wix?keyword=byu+independent+study+health+final+exam+answers PDF link annotation
    • http://promoocaoameericanas.com/wedding_design_templates_psd_freeycpmu.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/78330df3b.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/puziremaduzuwu_vometo_norarimikebo_fedegaluzeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_5fda8ee655dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fe813a742d88.pdfIn PDF document text
    • http://paksorond.xyz/vice_news_jobs_usao7i8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fd331bc2d1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5fd6a6dda18f7.pdfIn PDF document text
    • http://kernig.store/xeleziszsc7k.pdfIn PDF document text
    • http://bufo.online/luzibifuwavajovowefajuvadex3v.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/casio_wr50m_instruction_manual5bv8m.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/jufuraxuvifilugewuda.pdfIn PDF document text
    • http://sparzha.club/46950315761j4jjo.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/navy_plane_simulator_3d_apkcsjra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/neporezofov/user_guide_template_word_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/ita_matrix_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/zusadizudizezobevusa.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/aloe_vera_planta_medicinal.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/83446397983.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/educating_psyche_ielts_reading_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/sidonu.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/astroneer_for_pc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 5592 bytes
SHA-256: 51a5b92ad5d21ed6b0434624d59c502278c5e1354d46e03b049857c84fe00c77
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 10172 bytes
SHA-256: edd6f4d25bcc176283ed82019886cb7e4dde6d2509efcd21425bfa35224b54a1

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