Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb69a387d6305942…

MALICIOUS

PDF

79.3 KB Created: 2021-02-09 14:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ae9ea449527f96e5863e0c25df2248a SHA-1: cd300115cb6aaee196b7d5738ecc7bf93dbb4cca SHA-256: eb69a387d6305942cfc90dd9ef1c4ab502a538b10602c2c759b591d0b38f89a6
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/wb?keyword=cambridge%20colleges%20guide', are designed to redirect users to potentially harmful sites. The document's structure and numerous links suggest a phishing or malware distribution attempt.

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 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://crophysi.ru/wb?keyword=cambridge%20colleges%20guide In PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/83f334d9.pdfIn PDF document text
    • http://copyright-central-media.com/rinigaferezuwilfdxh.pdfIn PDF document text
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/311018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_600fbb7c7a9f0.pdfIn PDF document text
    • https://budovatepita.weebly.com/uploads/1/3/1/3/131398204/5260868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_600ea38c347db.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/0f8967311fb2.pdfIn PDF document text
    • http://ubsvp.com/spaceballs_characters_yogurt3d11f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff08166d15bb.pdfIn PDF document text
    • http://wwnews.site/fox_engine_downloadbij2p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molutuganum.epizy.com/livamijozukikexuzibusu.pdfIn PDF document text
    • http://welolazudadiv.epizy.com/darude_sandstorm_sheet_music_flute.pdfIn PDF document text
    • http://wigazimo.epizy.com/catholic_netflix_formed.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 5304 bytes
SHA-256: 5da0690ed9bf124c13d45f3828524db7b326ae02773343017471071912c6e55e
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 10612 bytes
SHA-256: 8109378e211023703f09260d4cc165f47d07a96ebaed5a9e60e57d02c2b3ebdd

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