Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fcae6565b12479…

MALICIOUS

PDF

91.4 KB Created: 2021-02-10 05:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 372135152d147fc9589e2851796e4302 SHA-1: 3758b8a50e88bf9e51e51e005f4cc3864964e613 SHA-256: 66fcae6565b12479c2c11c1d29eb140838cab6094386b540e99d595eea6530cb
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs implies a phishing or spam campaign context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/123?utm_term=javascript+visual+quickstart+guide+9th+edition+pdf PDF link annotation
    • http://kinokaiff.space/mofasuvizuresoa0iyh.pdfIn PDF document text
    • http://1xbets-regs.site/21505075275zx8et.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/1c44217b4.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/7004068.pdfIn PDF document text
    • http://prizinsta24.online/yowhatsapp_new_20184agkz.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/vomarebow.pdfIn PDF document text
    • http://organize.shop/kgb_archiver_softonic5if8x.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/k0pjcY8/1509205826.pdfIn PDF document text
    • http://gufutaca1.xyz/adding_text_to_photo_android1aahl.pdfIn PDF document text
    • http://rezotu.xyz/riso_gr3750_service_manualm3aaa.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/cambridge_igcse_mathematics975kv.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/maninubejiv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 3620 bytes
SHA-256: f8842d7b984172604b7ad3aac73a0b944d041944b7db31669a35bddd7873fbda
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 5812 bytes
SHA-256: a9b749aac95d670af6b0034d4cf28773705b0a57d1b9caf6fcaf3808beb06ac5
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 13936 bytes
SHA-256: 3e5c1bb19c3344ceaa040342496ebbc28b69c1964eecdf09aef57231cb93c320
font_03_sfnt_off00014a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6F 16148 bytes
SHA-256: 4d6819832c82b08b9ce7c706b5cb98ac46ced7cbb743301eca90489f0e3e1710

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