Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd16227c15bf67b…

MALICIOUS

PDF

91.3 KB Created: 2021-05-08 14:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d576890f445a5a21d25ee7a01c1283 SHA-1: 26f9a5c1413032852320c37f203b2edde06f888a SHA-256: 3cd16227c15bf67bceac3e32c106139803535da16a9a631306d9e465c027d682
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one that appears to be a redirector with a search query, suggesting an attempt to lure users to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, further supporting the phishing or malware delivery motive.

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://jacksth.ru/strik?utm_term=blue+moon+of+kentucky+chords+paul+mccartney
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/fosoteduwus_dunuvuva_newofas_xalux.pdf
    • http://copyright-supporthelp.com/una_taza_de_harina_de_avena_en_gramosextkn.pdf
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/zadafox.pdf
    • http://salleapp.xyz/luxidalibeckv5w.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600b2e599ed9d.pdf
    • http://zasoremejoka.iblogger.org/luwuritolaxusubikunowibus.pdf
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5ffe482bc392d.pdf
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/tabewutijofo.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_6058daa097391.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_8c0186b5fca64386a3f6815d64b8c89e.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_95ee1f8de0c744f6811135366abab6b5.pdf?index=true
    • http://wijopimitiraze.epizy.com/zotavofitaveti.pdf
    • https://s3.amazonaws.com/tobobowu/sistema_endocrino_cuales_son_las_enfermedades_mas_comunes.pdf
    • http://bezegorev.epizy.com/34121298292.pdf
    • http://rusozetowozo.epizy.com/precalculus_with_limits_chapter_2.5_answers.pdf
    • http://fasilew.epizy.com/wekupejaxabiboniw.pdf
    • https://s3.amazonaws.com/fojaxexino/89140829484.pdf
    • https://s3.amazonaws.com/suzixegazunow/64015685247.pdf
    • https://s3.amazonaws.com/bogeguva/list_of_dow_stock_symbols.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012784.bin
0da35ffc601773a32f7ebe76d5f4944452da1f6e179f798f57487514752c6e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 5612 bytes
font_01_sfnt_off00013a7e.bin
1bdf4c22a3b6841417210243aeaa470e51d6a8747f0d04fdda3ed4420d8f2ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7E 10920 bytes

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