Malicious PDF — malware analysis report

Static analysis result for SHA-256 6477ca9150c7b67e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 12:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8b83e907cc6e6915bba8b7b280f4b33f SHA-1: 7f1805f27fd25cd48a98bb830f229a1dd8ce494b SHA-256: 6477ca9150c7b67ed5d800fa4717170b9df00ea163ceaf29977e439833a3ba9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to external URLs such as 'https://midufefew.ru/award?keyword=riesgo+y+rendimiento+financiero+pdf'. The PDF document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or malware distribution attempt.

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://midufefew.ru/award?keyword=riesgo+y+rendimiento+financiero+pdf PDF link annotation
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/jataz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fdb0b71ce348.pdfIn PDF document text
    • https://befinutu.weebly.com/uploads/1/3/5/9/135971501/difisikarasi.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/integral_of_sinxcosx2.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/school_application_form_format.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/gafosavakexalawodeliwad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fcae4da25fd1.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/perodijiwiledawaxerofobo.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/pijetobewuguwuw-ligibidafosi-wakaxel.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/essential_hypertension.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/je7cEhg/kotewimefig.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/fG587wt/89150946123.pdfIn PDF document text
    • https://tesuxoka.weebly.com/uploads/1/3/4/4/134473976/nototopavan_gumotizubose.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/birthday_party_planner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_60304f554b17e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxolavomuzo.myartsonline.com/25692404616.pdfIn PDF document text
    • http://pibagejebex.epizy.com/cv_template_word_2007_free.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/pikesumemadeso.pdfIn PDF document text
    • http://damabop.epizy.com/gidomupexuverego.pdfIn PDF document text
    • http://vewabepugu.epizy.com/pomikotururifero.pdfIn PDF document text
    • http://zozoresupiz.epizy.com/ejercicios_resueltos_matematicas_financieras_1_bachillerato.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/39974774446.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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 5552 bytes
SHA-256: 13f11f1857ec7172c92e58f6c5e1f658ecaaa7f52f688a0f4197ae44dbc8dcbb
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 12552 bytes
SHA-256: e66ee7117b7f191a4d059e697b4308de695ad1e3568769678e54e7b1a5e9f150

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