Malicious PDF — malware analysis report

Static analysis result for SHA-256 735d1da33e66c8d3…

MALICIOUS

PDF

74.9 KB Created: 2021-02-15 12:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: debb70711f96c025daf187ef7fac80bf SHA-1: 157d876222919d5dc040da94ceab6c00759fe6c0 SHA-256: 735d1da33e66c8d33daeb50514146d3f17e3183a638c9b3d4c3b093f6a67957c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a malicious intent to distribute or redirect traffic to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=the+tempest+sparknotes+act+3+scene+1 PDF link annotation
    • http://sibuvre.com/what_comes_after_the_knowledge_economy5mig4.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/hdvTidF/home_memories_mod_apk_unlimited_stars.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_60253a762a356.pdfIn PDF document text
    • http://ontrade.top/akka_framework_tutorialmb4z6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_600b8fd60310a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fc66bdb357d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5fe331fa9ad51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5ff967595a22d.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jc0DPhf/38042466445.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/146a9d7a81de04.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/eLhiiWd/physics_class_9_book_ncert.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/8233058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_6018b0b5d277d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_6026e10cb8886.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/lieFjhU/25248892886.pdfIn PDF document text
    • http://usacreditmonitoring.info/vehicle_registration_transfer_queensland_formzjc9l.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/jibewaxibafad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://burijudipo.epizy.com/tagalog_to_english_grammar_translator_free.pdfIn PDF document text
    • http://tutopuwozel.epizy.com/charlie_brown_song_piano_sheet.pdfIn PDF document text
    • http://nuxidowu.epizy.com/dusefumiworuwutesabewo.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5372 bytes
SHA-256: afdb3c4bdf3625ae86e88d07c9d72e2520c09dc38480959f90ebdf37b5cb75cc
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10520 bytes
SHA-256: a7a335c3096a42c80d4bbd78a52d533de76286ebf6e6c3eee7784e2bdba435a1

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