Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bff44cf7fabc245…

MALICIOUS

PDF

79.5 KB Created: 2021-02-14 16:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a505a2c4b83b915a4e9e7a55cfbf329a SHA-1: ec48a45125a946a4e281ff0dff970f79a0ffa1c2 SHA-256: 8bff44cf7fabc24562d3994030e8ef273a7c98667a7d49e54ff5f3555b860f76
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest malicious intent, likely for phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=abiotic+vs+biotic+factors+venn+diagram+worksheet+answers In PDF document text
    • http://gukapeb.iblogger.org/fados.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5fd6a4f414f0a.pdfIn PDF document text
    • http://brosbass.com/seteravuwop9f1f.pdfIn PDF document text
    • http://on-arenas.com/staples_mailmate_spl-727mm7k3g8.pdfIn PDF document text
    • http://fortuneo-enligne.com/409007103125f3k6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6024f5fa1ff2a.pdfIn PDF document text
    • http://servicesforsupport.com/2274464200uogxr.pdfIn PDF document text
    • http://amaryllis.space/barikagavetukuvalz02vu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456982/normal_60076865eddf4.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/2thciex/17037320020.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/woxewiwupir/72868475608.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/pajivofoderebojumom.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/30064496328.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/division_2_weapon_talents_spreadsheet.pdfIn PDF document text
    • http://daxotumolurotaw.rf.gd/all_video_er_app_free.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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 5748 bytes
SHA-256: e01016de52758d9979c90ab4c7a736a29f4c640d41768ed2a86df2c6a2ff3908
font_01_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 10980 bytes
SHA-256: 612f603973a7e1ab2e6de44b8923282b9c16f7ec320b00201f3c2e838d494c83

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