Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d8de0836fd9e9e…

MALICIOUS

PDF

72.8 KB Created: 2021-03-07 10:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8d4df3ac9d3fa9c35490b19671e404e9 SHA-1: b4c87b1c460ee496fb1912ccce5055461b25793d SHA-256: 01d8de0836fd9e9e96c15c7ba8da873a985acba60e5cdb97f878ec231fa00e0a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'kuzutuzo.ru', suggesting it's part of a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=dead+target+apk+mod+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383806/normal_60021adda0fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5fdbced2afa02.pdfIn PDF document text
    • http://rajelakitapeki.iblogger.org/45777938082.pdfIn PDF document text
    • http://xodowomasugis.iblogger.org/medikefezokulow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezipibuboxigo.epizy.com/edexcel_a_level_geography_book_1_answers.pdfIn PDF document text
    • http://soveralenox.epizy.com/python_download_file_from_url_with_login.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/honeywell_thermostat_installation_manual.pdfIn PDF document text
    • http://kepinud.rf.gd/butterfly_knife_party_template.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/fear_of_god_1_size_guide.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_3bdd55abe1e444ef8da1bda6e2509fb7.pdf?index=trueIn PDF document text
    • http://xewujurobozum.rf.gd/a_first_course_in_bayesian_statistical_methods_solution.pdfIn PDF document text
    • http://sodexodape.rf.gd/18014055283.pdfIn PDF document text
    • http://titarejidawe.epizy.com/56791365403.pdfIn PDF document text
    • http://modedavap.epizy.com/surabixelosa.pdfIn PDF document text
    • http://safutid.epizy.com/mewegobibifote.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/43855989079.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_97a2740404434f04838f475b4b927568.pdf?index=trueIn 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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 5368 bytes
SHA-256: af4ba6ad141c71202529d7562f361ad39718ee94aa6ae1851c3f869311e0c019
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10412 bytes
SHA-256: a3f667d7c9c0a716ddb6951d7b4e3aabd936ee7cdcb44c04d033d022089ece3a

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