Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5683b22916fbc…

MALICIOUS

PDF

75.3 KB Created: 2021-02-10 08:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f791d08aed6ab00df3ff8399a2c93ff1 SHA-1: 0efc9bb8e4b5d10c74166e6d3338bd0775b85f3d SHA-256: deb5683b22916fbcb5950b9cdf5d722f56d3e16fe8f84e81b5e7dc5295dab794
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though obfuscated, suggests a lure related to search queries.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/wb?keyword=smart%20answers%20to%20how%20old%20are%20you PDF link annotation
    • http://wonnaturila.space/wonatozutiratinapuwism47t3.pdfIn PDF document text
    • http://trudogoliya.online/kamasutra_book_with_pictures8p09t.pdfIn PDF document text
    • http://arevakar-travel.com/disney_magic_kingdoms_mod_apk_android_132d9y.pdfIn PDF document text
    • http://my-favshopf.online/lafabilabanifexeroebgbh.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/dWhwDgf/80945465120.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/431521.pdfIn PDF document text
    • http://draiwenstore.online/game_center_iphone_appgoiyf.pdfIn PDF document text
    • http://pasendapp.online/39534405210524k.pdfIn PDF document text
    • http://naturmilans.fun/15530282905v50fb.pdfIn PDF document text
    • http://wssummer.space/inkstar_tattoo_machines0mxvv.pdfIn PDF document text
    • http://good-production9.site/firefox_portable_52._9fgqzg.pdfIn PDF document text
    • http://aslixan.com/fire_safety_worksheets_preschoolnkfm4.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5360 bytes
SHA-256: 4007aede164a3e15ccddfb7e8ca643f1c57eb53152a312ef7cdd0c426cdaaa1e
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 11016 bytes
SHA-256: 6069050b7c94f34eb4ae90763a36fa345d6e2ba487643472735bcf5d073becd0

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