Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71cbc24344d3b53…

MALICIOUS

PDF

47.4 KB Created: 2020-10-04 20:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ac7f84028f65e1bac7eced65204049e4 SHA-1: 4e99ca16641f740f8417a82d169ee9fca25aa375 SHA-256: d71cbc24344d3b5337d2e77c0743990b486575e4ba7063fa3d488e0fee6e4ed0
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://cctraff.ru/strik?keyword=essentials+of+sociology+henslin In PDF document text
    • http://rufomupe.sevryna.com/uploads/1/3/0/8/130873786/8ef8b5f4c.pdfIn PDF document text
    • http://files.stpaullutheranph.com/uploads/1/3/1/8/131856034/solidobokapitu.pdfIn PDF document text
    • http://mivitu.mikemarrone.com/uploads/1/3/0/7/130738546/gomomexolok.pdfIn PDF document text
    • http://gelodobex.chocolateguitars.net/uploads/1/3/2/6/132681361/944620.pdfIn PDF document text
    • http://vexuwuves.obafemio.com/uploads/1/3/2/6/132695399/baf4ca1.pdfIn PDF document text
    • http://fumoke.dearkellydear.com/uploads/1/3/1/4/131406893/pugawugutibamexon.pdfIn PDF document text
    • http://files.mbbizwell.com/uploads/1/3/1/6/131637302/fbd3962e5be01b.pdfIn PDF document text
    • http://gejomewew.itinerantliteratebooks.com/uploads/1/3/0/8/130874498/gagapanuse.pdfIn PDF document text
    • http://xemegafa.vapekingstogo.com/uploads/1/3/1/4/131406934/wotasozagunen.pdfIn PDF document text
    • http://rakanewi.isiwest.org/uploads/1/3/1/6/131606575/3050448.pdfIn PDF document text
    • http://vatusalem.flytyingforcescustomtiedflies.com/uploads/1/3/1/1/131163717/8394839.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/guler.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/parafiwanaroj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00007a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A66 5108 bytes
SHA-256: 103ad93bc06cdf8bc687665d3ad5f2383afa85ea8a8f764d987096f31d0df365
font_01_sfnt_off00008bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 10920 bytes
SHA-256: 1175fb4c8f4ccdc0f67a3b6587f6ec1d4211cc9273f618158cb423a3f2f934b1