Malicious PDF — malware analysis report

Static analysis result for SHA-256 711162be53b8f52b…

MALICIOUS

PDF

39.5 KB Created: 2020-09-30 12:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: cba109bee26d06331e58bcd3edb2dad1 SHA-1: 65519a24fae4f54b630c7ec9cf13594d35e428ed SHA-256: 711162be53b8f52be08224cbd5e33c30730015e0cf074e161a378469701c7cfe
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=ppsc+chemistry+past+papers+pdf In PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/nufedebebununovumiloja.pdfIn PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/53562835632.pdfIn PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/41937063226.pdfIn PDF document text
    • https://site-1037896.mozfiles.com/files/1037896/21474694068.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/8017831832.pdfIn PDF document text
    • http://files.hoa14.com/uploads/1/3/0/8/130813770/vunakarubosura_fiwofaj_nevusuzoza_zekimirofusi.pdfIn PDF document text
    • http://files.slievenamonnurseries.com/uploads/1/3/0/8/130814763/mazegikesomewa_niledu.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/judogalurorukivi.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/12378640516.pdfIn PDF document text
    • https://site-1038768.mozfiles.com/files/1038768/sukomesa.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/mudum.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/8dbb5e54-61e6-4274-969e-5423846ddc00/40234035277.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_off00005cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD9 5468 bytes
SHA-256: efb21d65070a0ef01a6907f5d1cc9b074632f4b849e782cbec26ac5168a6a464
font_01_sfnt_off00006f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 9936 bytes
SHA-256: 8f759d67245d12cd4cfe91d17f1319af1ddc4eb0474a89b1f46058f4d71a6517