Malicious PDF — malware analysis report

Static analysis result for SHA-256 037257bb40f95056…

MALICIOUS

PDF

73.5 KB Created: 2021-02-28 11:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4efe2bba47d772bb4e5a934cd71c5986 SHA-1: 518a6f847729d9c0ed14ad86282ab0fb3f673ea2 SHA-256: 037257bb40f950565980f66209a6e70972e8c9dc8d24bfe9a2cfd7c76050768f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a game, likely intended to trick users into visiting the malicious sites.

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 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://jumiwimov.ru/award?keyword=4+pic+1+word+6+letters+level+2451 PDF link annotation
    • https://palejuzuz.weebly.com/uploads/1/3/5/9/135959315/mubeluzatubo.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/resumen_de_once_minutos_de_paulo_coelho_por_capitulos.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/37364599441.pdfIn PDF document text
    • http://medway24.com/figojugujalowasesidq7ac.pdfIn PDF document text
    • https://tigobatimomovo.weebly.com/uploads/1/3/2/7/132740361/5ceb1e0.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/sanorusobovamumaxivavuz.pdfIn PDF document text
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/586c2c.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/terut.pdfIn PDF document text
    • http://xonubevobupok.iblogger.org/free_music_player_for_windows_10.pdfIn PDF document text
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/3751743.pdfIn PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/buxemofosa_pefetut_gafulasabovo.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/dugibabafod/kingdom_rush_frontiers_achievements_guide.pdfIn PDF document text
    • http://lususexore.epizy.com/genoa_city_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/40249422709.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/html_code_formatter_vscode.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/44578644790.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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 5464 bytes
SHA-256: 0b62a9e78ef2555ee8e8429284d1b93ca34bb5ce299623ff5600ed4709d9769f
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10456 bytes
SHA-256: aeea2c28200d6f114e7cd4a095bfbd3a3f016a80cc7d1beb7cd07a1633ce84dc

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