Malicious PDF — malware analysis report

Static analysis result for SHA-256 854344b635825782…

MALICIOUS

PDF

39.3 KB Created: 2020-10-02 22:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1f93fec5781529a9db63bbaed33ba081 SHA-1: 94920add9ab4c796b52865a600150610203b5217 SHA-256: 854344b635825782d086a7c0f046d3293b7c457f79b1b6c982835b0b2a2a74b8
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://ggtraff.ru/strik?keyword=preschool+worksheets+letter+b In PDF document text
    • https://site-1039671.mozfiles.com/files/1039671/92822098745.pdfIn PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/sogewemokok.pdfIn PDF document text
    • https://site-1039311.mozfiles.com/files/1039311/89218712737.pdfIn PDF document text
    • https://site-1037890.mozfiles.com/files/1037890/seroxezirosesevidaxej.pdfIn PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/furafarumulib.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/jetotoxad.pdfIn PDF document text
    • https://site-1036693.mozfiles.com/files/1036693/87824700119.pdfIn PDF document text
    • http://files.daashgroup.com/uploads/1/3/1/4/131408581/saxulofowojaweluror.pdfIn PDF document text
    • http://files.hammondminiatures.com/uploads/1/3/1/3/131398149/texunidusuzum.pdfIn PDF document text
    • http://kuguler.dogamelbourne.com/uploads/1/3/1/0/131069934/giguz-meminuxaga-jimipepo.pdfIn PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/rufifetetasazafovolexi.pdfIn PDF document text
    • https://site-1038872.mozfiles.com/files/1038872/tufoborigifixinirusuj.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/bipaniwovupesoxi.pdfIn PDF document text
    • https://site-1038416.mozfiles.com/files/1038416/xasomulonidibur.pdfIn PDF document text
    • https://site-1038438.mozfiles.com/files/1038438/jisofetogepetadukis.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_off00005de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE3 4976 bytes
SHA-256: ddb6ed27903a20b782f183117f39e23ad578f983f4d63f11d2ad46d5bd71013d
font_01_sfnt_off00006edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDF 9816 bytes
SHA-256: addafdf64b27ff339f9d8dff3b802df3bf849a524b1c5aa703ef83c6c831a295