Malicious PDF — malware analysis report

Static analysis result for SHA-256 871c65bc597f773b…

MALICIOUS

PDF

73.2 KB Created: 2021-06-10 20:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 06e06f6a66985c2b00d5190057417910 SHA-1: ecd92348277c132d2a2f3a18091b500fa9ee5659 SHA-256: 871c65bc597f773bf96dd700916816036c3edc2e043289a22dd38808111725e0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=worksheet+7.+3+imperialism+asia+map PDF link annotation
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/ac2b40175d5981f.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/b55bdadbc9fd8.pdfIn PDF document text
    • https://xobazebesefegox.weebly.com/uploads/1/3/5/3/135321136/8630062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lezakoliz.pbworks.com/w/file/fetch/144699525/28387250201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39042592-040f-4913-b466-f642817c213c/mofuk.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/144483747/is_there_a_problem_with_yahoo_mail_tonight.pdfIn PDF document text
    • http://guwodav.pbworks.com/f/tom__jerry_2021_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a560d575-8946-45b4-a013-7b2b3e585e1a/esercizi_svolti_nomenclatura_chimica_organica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499ec10a-a187-4e11-842a-597378883e3f/sony_20.1_megapixel_digital_camera.pdfIn PDF document text
    • http://wawexigore.pbworks.com/f/how_to_download__install_coreldraw_2020_v22.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a341672-7d2c-4f90-bb1e-e66bc7f288c2/10209301717.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422664/gozivix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836a9937-d1fb-4c66-aced-e67cb5680115/26583575772.pdfIn PDF document text
    • http://jumedew.pbworks.com/f/sujaxa.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/followers_4_red_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c79b4d7-5837-469c-8264-6248c1714297/64015426703.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144447852/58783809256.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/how_to_stop_premature_ejaculation_of_sperm_naturally_at_home.pdfIn PDF document text
    • http://tirotibixup.pbworks.com/f/lalorozawizuvolovejiriz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0136efe4-2b8a-4e50-b34b-97f76451a7aa/68678718850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b60032a-bf9f-450b-890f-3cb89d53647c/73582637799.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/63918704794.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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 5412 bytes
SHA-256: e0fed7e147f913d77cbaac8d5b0b3b076cf01e5d892eaea8168e710bd5c120fe
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 10016 bytes
SHA-256: 5bfe286e13e6d12ca9545b1f0e46f18936b1706490cfeb53fb72d205466e6908