Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cecf6b9c73e2bb…

MALICIOUS

PDF

75.4 KB Created: 2021-01-28 14:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 655c06b052ea898179cd5b9f9d9dc24d SHA-1: 750f64329025d15af8661fc6bd23535d3dbf2526 SHA-256: f5cecf6b9c73e2bb5d0bba7b93a7224dd76c914d00fca136dcf8c37727307e43
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/aws?utm_term=nursery+worksheets+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_600b8ffc8e5ad.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/pikijofuniw_nuwavunenejesa_taragus_miwexololiduwep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_600b374daa6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_5fd8189c6f7ef.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/3ec7add3ba.pdfIn PDF document text
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/1307607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_5fdc5bf08e722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5fe5d5f91b2e8.pdfIn PDF document text
    • https://xutekesavugev.weebly.com/uploads/1/3/5/3/135316407/ridufugipami.pdfIn PDF document text
    • http://construt.site/wish_app_cart_not_working78x7o.pdfIn PDF document text
    • http://probmake12.xyz/funidunujasukomikeveflf335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5fd887a2731d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitelujojutomu.rf.gd/54429348171.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/34315997983.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/social_media_content_plan_template_excel.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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 4788 bytes
SHA-256: 705c9746dc1bcfa1e539d6db0fc73ed352d30fc5735ed5cecdd4e42b7ae3e678
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10904 bytes
SHA-256: 6cf6b325701caa57ac3ecb064f75335156af603e5a481a58838c7ed9815a1c79

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