Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3b574a3ce7619f…

MALICIOUS

PDF

76.8 KB Created: 2021-05-05 12:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe0108b36c80c922cf575f4bead6ddd3 SHA-1: 1324ca2b72eff935d380d973a3b07af84c0b9302 SHA-256: da3b574a3ce7619ffe03c176545dabc3216dd4434699bd1333f7d7f259c4278e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary external URI pointing to 'https://kuzutuzo.ru/strik'. This URL, along with many others, suggests a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

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://kuzutuzo.ru/strik?utm_term=what+are+5+parts+of+a+computer
    • http://bemoxanomazopix.iblogger.org/bituzigagazagetetetotev.pdf
    • http://wobodepubusa.22web.org/41691069059.pdf
    • http://prizyivnik.ru/what_is_cloud_computing_simple_explanation540eb.pdf
    • https://cdn.sqhk.co/velujuvaxal/hic4hgZ/tuletox.pdf
    • http://ig-about.net/how_to_speak_english_fluently_online_freef37cg.pdf
    • https://cdn.sqhk.co/lilovenodi/dKiMNjg/xadeda.pdf
    • https://cdn.sqhk.co/buwowunuras/gejfvgi/19323842964.pdf
    • https://cdn.sqhk.co/sixitigoxeto/VrigNYH/nopujipilabolufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d29c03c-1896-46db-925d-ba35f6276ed7/zofodapifanad.pdf
    • http://xilibosukotijob.epizy.com/poxafisedo.pdf
    • http://vukekabexipog.rf.gd/68181934192.pdf
    • https://uploads.strikinglycdn.com/files/9fa5a286-d74e-4acc-9ac6-f12ed6e8007e/gubaxugepogobojov.pdf
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_bfe3bbf8430d4f4a9b4f39f83305a51b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb0d6ad3-7dba-4d65-8f95-a3cab56acceb/dyson_light_ball_vacuum_manual.pdf
    • http://dojokoposexo.epizy.com/3ds_max_models_architecture_free.pdf
    • https://uploads.strikinglycdn.com/files/9535a7d7-e07f-489a-907f-6c0f31c0af0f/paint.net_download_mac_os_x.pdf
    • http://wegefug.rf.gd/rotigav.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_69062f7995eb4f2e807784deaa60962a.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_36fde5719568442aaa35a0f6b7b12681.pdf?index=true
    • http://tatasoge.epizy.com/jokugirujobawufezax.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_off0000efd2.bin
cd242a8633fe7977c6214765fc2ca4b984115c7176eedbd316752cf4819263c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5360 bytes
font_01_sfnt_off000101f5.bin
dbcd5492d8f1483ab8757307dfeda602eb58bc770ec501c3aeaf822bb40ab5d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 10644 bytes

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