Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f787fd184588f6c…

MALICIOUS

PDF

43.0 KB Created: 2020-09-29 20:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4295fbf6b2e8f3081d522058f094b16e SHA-1: b9e11363c4ab9f9fc8d472d4d5a661d0d6125581 SHA-256: 5f787fd184588f6caae5738ea96bbd7d74568ee3e088faca839ffcfbddfc0ef9
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ggtraff.ru/strik?keyword=aprenda+ingles+sozinho+gratis+pdf In PDF document text
    • http://pomonuba.cindaloushop.com/uploads/1/3/0/9/130969352/mupub_gifinaxopefebo_titiwogu_lujujubo.pdfIn PDF document text
    • http://jofufuse.railindustryforum.com/uploads/1/3/2/3/132303388/3553be.pdfIn PDF document text
    • http://bolotox.minjinkim.com/uploads/1/3/1/0/131070152/6570056.pdfIn PDF document text
    • http://gusep.beetzme.com/uploads/1/3/2/7/132712324/kojorabobuzuga_dujadubun_kudofutunav_tusasi.pdfIn PDF document text
    • http://files.shorewindbordercollies.com/uploads/1/3/1/3/131382320/90a47b.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/kojut.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/mosuwixafupeso.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/ganavudiraxajidavivipi.pdfIn PDF document text
    • https://site-1036938.mozfiles.com/files/1036938/35032646752.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/65311436935.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/pesokemufalovitosinat.pdfIn PDF document text
    • https://site-1036883.mozfiles.com/files/1036883/tutokatapuraxozifarefuwij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c45c09-a54b-4bdc-bef0-cd58c0fb5e42/guwowasipegozixilisop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7681e6-8515-460e-9c14-450dae13103e/vovugovigufexobigekal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7aa2a1-94c6-45af-b932-b1066f403d60/5492425801.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_off000069c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C0 5344 bytes
SHA-256: 0b19cfc0dbec68e8348cb7e339209be83bbaaf0174401a16df4f8a890223bff3
font_01_sfnt_off00007bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEF 10316 bytes
SHA-256: 55b42710868efd4414f6950779901fdc5e59a4c8188183073f866390a2bd14ea

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