Malicious PDF — malware analysis report

Static analysis result for SHA-256 258c248fcc9f4b65…

MALICIOUS

PDF

45.2 KB Created: 2020-10-01 01:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f58b7294ee74b7f8533eb7dced9dad0a SHA-1: e31a3874b0d7eb0c368887ef3d112dd35d21654e SHA-256: 258c248fcc9f4b6543a7c7784a4b22cc484d30421c251c024e55ad30287edd8e
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=reading+comprehension+skills+and+strategies+pdf In PDF document text
    • http://files.naturesmiraclesolutions.net/uploads/1/3/0/7/130776498/dapazilujav-kaxalibe-dozoluzekegu-lusaxup.pdfIn PDF document text
    • http://files.devolvedperspective.com/uploads/1/3/1/8/131871416/fuvopifofigovikim.pdfIn PDF document text
    • http://susugez.ethanhamby.com/uploads/1/3/0/7/130739445/jewogimutepopitobu.pdfIn PDF document text
    • http://gelake.whitehorsewomenshockey.com/uploads/1/3/1/3/131380284/ff46209e170cff1.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/lukafapoxarok.pdfIn PDF document text
    • https://site-1039332.mozfiles.com/files/1039332/fogamoveg.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/dizuwufesojakore.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/88285258-fa58-4491-97b2-bcd0c61c5166/muvutuzam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5d3c42-e5f4-485f-9beb-9f082199366c/23739225642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2bc1f8-43ea-4031-8acc-05546e130963/bidolikiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40710400-6225-4faa-918f-9cf00f099600/61013458417.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_off000073b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 5640 bytes
SHA-256: 17c8c5747db09f9d71e5050c3dce0b81724a719e3db720c012b9c41a543b5dd4
font_01_sfnt_off000086bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 9792 bytes
SHA-256: bef1f7430546b87b553a22aba9a45bc71f6b839d3608eecb279d8443358b7810