Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f9c7a9008c41bc…

MALICIOUS

PDF

76.7 KB Created: 2021-02-27 01:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4f365aea5cf7536d0f531789ba16505e SHA-1: 7ac0db9996dcce607d6d96639369622f081e3c64 SHA-256: 98f9c7a9008c41bc323c57897115689a67bf85d06789d375fc5b68d92c921d69
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://yafferge.ru/123?utm_term=how+to+use+biddeford+heated+throw In PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/1383832.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/5b78ec55e8bae.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/mezobafira_notovasi_pilapejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_6037ca2cccddf.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/ponumepogap-vekif.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/zenis_givolizokos_baravep.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/best_online_project_management_courses_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5ff3e305eb9cf.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/rikefipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe7ed5f1d693.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/48978175493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fedeaea0eb77.pdfIn PDF document text
    • http://alexsaf.ru/asking_alexandria_full_albummtgoa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/how_to_replace_a_washing_machine_agitator.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/checkouts_short_story_answers.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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5156 bytes
SHA-256: 1c76b285974100f32d4c0eee7afc929d704913d2197ede545871c2f90c780717
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10624 bytes
SHA-256: 75c8ed06e2f91fd5b4ff5ed9f32e0eea4c46073021d6dc76c5ee86f858bc780e

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