Malicious PDF — malware analysis report

Static analysis result for SHA-256 143e13180a9b4d88…

MALICIOUS

PDF

77.8 KB Created: 2021-04-08 14:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4d11369d49c02208d82d351adeb4d18 SHA-1: afafd9c76fc32b6cc53f5dbb2dec03865a4a738e SHA-256: 143e13180a9b4d88054b642ca04a21380fba5a5b987c75f0a411281d87a994e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=how+to+look+up+your+driving+record+online PDF link annotation
    • http://tradestaroffice.com/zipoditeragulnjy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60149f0d842f7.pdfIn PDF document text
    • http://coloradocustomelectric.com/file_academia_tanpa_loginvizvt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_60215cd048b15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fdfd5713d84d.pdfIn PDF document text
    • http://clientbluebadge.com/87772917506nob75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5fe32c57b13b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fd16e9248b5d.pdfIn PDF document text
    • http://labiosdewonda.com/jexudewomozevuflrwol.pdfIn PDF document text
    • http://dukawipo.22web.org/dumajifuterur.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/kexuri_wusovumigo.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/9160025.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/how_to_make_a_normal_map_in_gimp_2.8.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/jotoxinoborufew_zazaminuzir_vagaziz_wiwozomu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojisanomup.epizy.com/jomazenizidamufurotiju.pdfIn PDF document text
    • http://dugukob.rf.gd/niroparunugikajera.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/bowflex_xtreme_se_size.pdfIn PDF document text
    • http://mogewatiside.epizy.com/74160527341.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/passe_compose_etre_et_avoir_exercices.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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 5132 bytes
SHA-256: 83986cce7f720ebfcd4a314037d28965db4fc6a47babcb59b52decf88fa69861
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10736 bytes
SHA-256: 515a9f5dc0cc82f4ad5dd03c71b805f8bd2b7b1af274eda810265e9a1da68c94