Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d1fac5eda5a69…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 17:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 75d9ceb2adcb99c684431f64dc047566 SHA-1: 073a3618db270b9f6c5f1b39ae67a7e21c8b0fe3 SHA-256: 5b7d1fac5eda5a697bdeb7cdc3f15c764df684a2a03dca2e453cdf3aeb7382b9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains keywords like 'Babylon history pdf' and application metadata, which are likely lures to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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
  • 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://lozipotod.ru/award?keyword=babylon+history+pdf PDF link annotation
    • http://arendaavto.taxi/67871175125s6mqz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381547/normal_5fc7c06589a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_6011fb5227bb8.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/amadeus_basic_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fff7b2196d00.pdfIn PDF document text
    • http://lidlid.xyz/biology_project_karyotyping_activity_answers2ca4q.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/i7jjgeW/touch_em_all_joe_gif.pdfIn PDF document text
    • http://shoop-fo.ru/5079163952507c44.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/hgdgGFA/70948483701.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/advanced_english_speaking_phrases.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/que_es_la_musica_contemporanea.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dTp4co9/fanoji.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/fusidejebi/29651711615.pdfIn PDF document text
    • http://javodorudorujiw.epizy.com/66394005186.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/deconstructive_criticism.pdfIn PDF document text
    • http://gipanitefoj.epizy.com/waludikovuv.pdfIn PDF document text
    • http://muvubaxu.epizy.com/crystal_report_visual_studio_2017_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/xaroxabumuganazebabexo.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/news_reporter_salary_canada.pdfIn PDF document text
    • http://nemutevo.rf.gd/puranolatomewamixosi.pdfIn PDF document text
    • http://safifalemu.rf.gd/kivifotutepuvavo.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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 5420 bytes
SHA-256: c24f174442e03cc493229a9e79db778a2c496309299523abbd6d14869de99bc8
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 11440 bytes
SHA-256: cfc7f7e6de6e4557c15f9d6d33ee618cc59533aa4dabe36041fe6f6e30f0e40d

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