Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8f8f31b386dabb…

MALICIOUS

PDF

71.1 KB Created: 2021-02-28 23:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 24ed2d883ab64bfc1acd80150f532719 SHA-1: 2f5011695a572fd6be56b03f7ae610478346649d SHA-256: 4b8f8f31b386dabb606cfa8a9ce3b0954b891e82efd4369f2e13953bc693664f
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/award?keyword=what+size+battery+does+a+bose+remote+take PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fe4a73539d9f.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/hiML7he/dofuranego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_6039a6615308b.pdfIn PDF document text
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/7049200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_601b9c0476768.pdfIn PDF document text
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/8ab1c9cb829eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_5fd3ce025f6fe.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/milotomuxijobif.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/0eef98f309d4.pdfIn PDF document text
    • https://gatudawi.weebly.com/uploads/1/3/1/3/131379110/dc0b7d87ed5d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fc68df4a0e03.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/fiaeX66/zadofufipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494677/normal_603bb826cb493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5fd2c27e01823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_6010f82ccdb13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulanojejol.epizy.com/tutorial_dreamweaver_cc_2018_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/32148060240.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/sanikosafox.pdfIn PDF document text
    • http://rajemezipuz.rf.gd/fly_on_coldplay_sheet_music.pdfIn PDF document text
    • http://gorevifero.epizy.com/tekewupagaxuxutefi.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/us_student_visa_application_form.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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 5404 bytes
SHA-256: 992bff7da7c1bbfc4236eccf07faf15e882effa460f48d4513d9dbbf970cbedd
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10372 bytes
SHA-256: 4ce7a201f8aac1542438c0c3bd4a3d49ffbca9d9704c5a66ec2eb3a50e1920da

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