Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fcea86873e685d…

MALICIOUS

PDF

75.1 KB Created: 2021-06-05 22:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 98d044255bb0f659604a8a7b5ff67274 SHA-1: d36a4d536b90dbe466e571637f911d7e5d55cfc7 SHA-256: c5fcea86873e685d524cafc80ac9f6f50358126f0455ea46196c83bfda20242b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=blank+treble+and+bass+clef+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462730/normal_5fdedc15118e9.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/pediraxapusufup-vofuk-niwubizazini.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/jexanegetebezipuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_60117cee5b916.pdfIn PDF document text
    • https://mokoxofedig.weebly.com/uploads/1/3/4/8/134891763/rarogafodadadivon.pdfIn PDF document text
    • https://woseluwimi.weebly.com/uploads/1/3/4/1/134131525/2283cb5.pdfIn PDF document text
    • https://tozowibalap.weebly.com/uploads/1/3/4/3/134383498/pogonovez.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/1150821.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/185a1b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_6062e70cc4feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6012fb982af41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_60034f113b47a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5fcd7a8a0f30e.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/a223e74b10d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_600f4c0323f56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374181/normal_5ffa75518cda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_606b31bad2cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5fdbd6b3d0d1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fe45adce09f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5ffcd74fac529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozuwef.pbworks.com/f/proyecto_de_vida_creativo_bachillerato.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/mini_international_neuropsychiatric_interview_kid.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144539172/2009_mathcounts_state_sprint_round.pdfIn PDF document text
    • http://seromazu.pbworks.com/f/10099552309.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144498633/how_to_make_a_wedding_ceremony_program_fan.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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 5452 bytes
SHA-256: acba7dd1aae722faed56ad9dc4e742f328ab843beb52999c7b535996a257ae10
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10816 bytes
SHA-256: b2cba7ce712dec3472b9e85dbc69b8fcdd427581a72d75e5e7bdffdc95d49c89

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