Malicious PDF — malware analysis report

Static analysis result for SHA-256 955355a1ab1b8a91…

MALICIOUS

PDF

81.1 KB Created: 2021-04-04 07:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3314cecc0caaf72298fd573e427a2366 SHA-1: 46b0579a6076b9b98ca32df4ffc4a0d78a5024c3 SHA-256: 955355a1ab1b8a9178e0433577c591840d72c5d4cc59d1ff246dd3110c6f0f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, including one to 'soxebez.ru', suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=pathfinder+hybrid+classes+review PDF link annotation
    • http://gexomafe.mypressonline.com/what_is_narrative_essay_slideshare.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/adolf_hitler_books.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/aptitude_questions_and_answers_with_explanation_download.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/zobuwubedak/uc_browser_apk_install.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/ableton_live_10_free_full_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/sozazejipudusutaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0f5293-f038-4a14-b867-9fa4d9fbf749/all_souls_day_spanish_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/441737401.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_bd6596dbb73c48e08e177b6a0863e4a2.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_1f7e43de009c42fe9772f84ceaee0804.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_c6dfca4ccbe24ad583c12ad5059eb30e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/tusan.pdfIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_917fed67e87c4c0b8951728c8155345b.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_513d0ac8562b4bff98d35e145fd258ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/scarborough_fair_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/sarubilipunenazeres.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/21607203271.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_f8493010569d4aa5898e1e59b84049a7.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_f31464f9b8b04532af7cefdbe08090a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67f87ef-37b0-4372-8b85-6b042baeb8bc/relacion_de_materia_y_energia_en_quimica.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_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 5504 bytes
SHA-256: bd3a15ecf8c3af4b567ff56f24ec31da75c0b6935a1275c7f8ba2eaa6e108bc8
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 11080 bytes
SHA-256: 6474c4dc6b176b83b70253e416e4cbf603c7514c33a866503525b914866b60f0

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