Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5a3e1a7ed9ce8c…

MALICIOUS

PDF

72.0 KB Created: 2021-02-22 17:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7dcb6b30549866dd979a5a29b72aec85 SHA-1: 5fcc58aa33c72149b6826cd650c281e54be1bf3c SHA-256: 5b5a3e1a7ed9ce8c6e81b48eed023852cabf2da4298e7044ea41a97625c55138
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing indicates it is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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 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://baarspo.ru/strik?utm_term=inorganic+chemistry+jobs+in+mumbai PDF link annotation
    • http://sasezifunapa.iblogger.org/92199435233.pdfIn PDF document text
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/zaditulo.pdfIn PDF document text
    • http://bixuvetojotenes.22web.org/49294598594.pdfIn PDF document text
    • http://jesusotes.22web.org/zejawudanevu.pdfIn PDF document text
    • http://idealica-italiauficiale.website/pilot_logbook_app_australiazwxnt.pdfIn PDF document text
    • http://worldworkbook.com/gunojezimrpd15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485569/normal_5fcc47baab81c.pdfIn PDF document text
    • http://wawovotem.22web.org/iaea_fukushima_report.pdfIn PDF document text
    • http://pl50off.info/77020330493saita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_6009044d0f39e.pdfIn PDF document text
    • http://leree4.club/wonderful_things_you_will_bep9x13.pdfIn PDF document text
    • http://mkr-olimp.info/what_year_did_the_ds_lite_come_outqeazs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/faluzotixupi/trane_chiller_manual_rtwa.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/nupimamugijor.pdfIn PDF document text
    • http://zupotid.epizy.com/apache_lucene_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 5316 bytes
SHA-256: 94625f84a2749d1358100fcd84a8f80a796c715a54b9fd5803706370743ecde1
font_01_sfnt_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 9960 bytes
SHA-256: 4ed22ff01ea25d3c64ea433cfa8c1716f40ff0e86866393f817bf17a9a5abb0a
font_02_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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