Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b275d3ec39f6361…

MALICIOUS

PDF

92.9 KB Created: 2021-03-29 14:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28052af9ee4af84b412bb6e04e5cbd4e SHA-1: 78bd2ab822394a801eb233b4da47c22767f39219 SHA-256: 9b275d3ec39f6361cc9a5f4135b3f3960a5b8eb76300b003bac574110bd5a71c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'botokaw.ru', suggesting it functions as a link farm to redirect users to potentially harmful sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this document is designed to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=2014+ford+mustang+gt+premium+for+sale+near+me
    • http://dufifudusimube.mygamesonline.org/vocabulaire_informatique_anglais_franais.pdf
    • http://paxezimusosesa.scienceontheweb.net/17639153044.pdf
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/jiniwe-sevobuxijivejog-sipabuwisozu-japotidisip.pdf
    • http://mafonofolifeda.22web.org/xubanofikajapores.pdf
    • http://xazapefunel.getenjoyment.net/genanadusetunopamipabomo.pdf
    • http://zedakobogesa.mypressonline.com/mebosol.pdf
    • http://pusatokolerax.mywebcommunity.org/rupobovewusasikuzure.pdf
    • http://gosoxegekiri.mywebcommunity.org/tikedobimamifisifa.pdf
    • https://ponefapu.weebly.com/uploads/1/3/1/6/131637257/sekifogib.pdf
    • https://kevelowomovozi.weebly.com/uploads/1/3/4/0/134012304/sovepivuvox.pdf
    • https://sojasokavipives.weebly.com/uploads/1/3/4/6/134677313/2044752.pdf
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/sopuvo_rugudedorug_pikilezulivu_derawawulafiw.pdf
    • http://ropozol.22web.org/strength_to_love_farm.pdf
    • http://fodefon.getenjoyment.net/zisalosexisojumubelotufer.pdf
    • http://paxezot.getenjoyment.net/blue_iris_software_alternative.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ea74bc0d-6c0a-426b-ab60-7519ed3ac20f/how_to_breed_moina.pdf
    • http://pabewuvuxaf.onlinewebshop.net/7364493103.pdf
    • http://zikoliduxa.atwebpages.com/how_to_be_good_at_public_relations.pdf
    • https://uploads.strikinglycdn.com/files/b8a0b0e3-3350-46d1-8ea3-815db8d3c38c/how_to_create_a_memory_book_for_your_child.pdf
    • http://fetekovabu.onlinewebshop.net/jeu_de_cartes_a_2_facile.pdf
    • http://bakilipos.epizy.com/danebi.pdf
    • http://gurebuvijo.epizy.com/7869989322.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012109.bin
583db1f187c6ac36c6027b13e40277b4cab5c13f16958a828cb46891e3782f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 5560 bytes
font_01_sfnt_off000133cf.bin
74c15fc4ee3d7dccdc912807dcc07368bd99c6e427f3ab2abe46eed08a189ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 10752 bytes
font_02_sfnt_off00015866.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15866 4324 bytes

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