Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c47738f368347c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 04:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa373c63699e1f72b830e002bbf533af SHA-1: 1e805f59aed31b9fe3a46ebdbe157c9d1e582cab SHA-256: e3c47738f368347c3be9254b9c9d8b95b523cc709d3db5ec13326cadc140c3ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=parts+of+speech+practice+worksheets PDF link annotation
    • http://hotel-engels.ru/wokukofewafawuregusul4awpq.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/Yngiifj/vavomojubuwudexapeforafu.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/meningitis_bacteriana_neonatal.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/basic_guitar_chord_sheets_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/c1C7gcd/fajigosunutojufo.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/hj6ks2v/iba_guidelines_francais.pdfIn PDF document text
    • http://inmyshtangen.xyz/ganavc6zne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/tewixajezilewamuzowisi.pdfIn PDF document text
    • http://gerekuvuburase.epizy.com/active_collab_app.pdfIn PDF document text
    • http://lubesakitulifo.epizy.com/what_happens_on_december_28.pdfIn PDF document text
    • http://bosevugenuroto.epizy.com/bangla_beauty_tips_book.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/solujefefuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/58011269482.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/bismillah_wallpaper_free.pdfIn PDF document text
    • http://febejesibek.rf.gd/autoimmune_pancreatitis_guidelines.pdfIn PDF document text
    • http://wexaxota.epizy.com/ambrose_alli_university_admission_form.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_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 5228 bytes
SHA-256: 5cb284b29b033d3a828047010d180cfc1a655292a2ac683ce070f8c8019de446
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 10836 bytes
SHA-256: b1f6564a56d69a12458327f842a475a23e6c55c7c045cbcd20e2e02ed3e79436

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