Malicious PDF — malware analysis report

Static analysis result for SHA-256 5211cb89344d8fcd…

MALICIOUS

PDF

75.5 KB Created: 2020-11-20 02:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8a00b752700e1daad8db1b3f231748f8 SHA-1: dbd0d55c6cf36cdad563702fc33f92c1f7e03003 SHA-256: 5211cb89344d8fcd7d2a6abbcde9dfd064869582a41a17384fe75ce33282c11f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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?utm_term=the+fall+of+gondolin+pdf In PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/2681029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f975ee4f390f.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/tuxedevaruxotex.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/8923fb79-5046-47a0-8a4c-d50113354568/63308039723.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/zygor_leveling_guide_torrent.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/sinirixapikep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e668a02-d6ad-4096-80b0-7178e5ad1e6a/729098749.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/guzominuwujetofefipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb689ebe-47ac-499c-8a23-87e8a4ea2247/11469440420.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/92261663197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ecf199-99e1-4f18-b603-36f3e30001f0/vosoxizokafo.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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 4976 bytes
SHA-256: 3ad46c5d8c57da2ca566aaf6dc35d59215ae2365b3731add3f42e10f5d52c412
font_01_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 11956 bytes
SHA-256: d7595fb99d71f6ebb89dc67fbc61a452eb5507a3f4dba5bd8efe0ddd8b797718

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