Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a6f0327baadc9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 05:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed899310be391fc7745732d1c00a2e2e SHA-1: 546ce488556494c48b881abcd19ad144cd1faa26 SHA-256: 756a6f0327baadc9cb4924bc490421faa5fddde729021c6d9ce7e3eadfa762bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a keyword-rich page, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file. No scripts were extracted, but the presence of numerous external links indicates a likely redirection or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=cellular+respiration+and+photosynthesis+concept+map
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5ff55487135dd.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/a8758baf11f2660.pdf
    • https://cdn-cms.f-static.net/uploads/4452851/normal_6046c666514e8.pdf
    • https://cdn-cms.f-static.net/uploads/4422620/normal_60351bfd8c2ce.pdf
    • https://static.s123-cdn-static.com/uploads/4446394/normal_60030b626a0eb.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601f66c1c1383.pdf
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6022b403b2697.pdf
    • https://cdn-cms.f-static.net/uploads/4454277/normal_5fd9c23fb4455.pdf
    • http://vexidizagopukib.22web.org/marine_boilers.pdf
    • http://sugoxebojun.getenjoyment.net/kilexibopamej.pdf
    • https://cdn-cms.f-static.net/uploads/4469834/normal_600ab2fcd6cb3.pdf
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/vasolupepibo.pdf
    • http://gasurorir.sportsontheweb.net/fetujakonelupijan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://norisufa.epizy.com/eureka_math_grade_8_module_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/b8e24304-f361-4eeb-8d05-b06b029c902c/construction_project_manager_salary_austin_tx.pdf
    • http://xogonat.epizy.com/68803729359.pdf
    • https://uploads.strikinglycdn.com/files/263883af-c4dc-4a12-a037-83fe504b6e14/fitekujupisuni.pdf
    • http://xijejuvi.myartsonline.com/oracle_database_11g_sql_commands.pdf
    • http://fusuzuveraku.epizy.com/adding_decimals_math_worksheets.pdf
    • http://zilomit.epizy.com/apostolic_gospel_songs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f0.bin
7c8445bafdcd7a60b7effffee68a5a580ec0c263cdda01d8f39f933eabc3aec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 5320 bytes
font_01_sfnt_off000105e2.bin
3037e9f1791ec44d724bdf098c0ff8dbdd50ece14b2cc0141125db7b00c5509c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 11932 bytes

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