Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b1f0c11f06cde9…

MALICIOUS

PDF

69.7 KB Created: 2021-04-06 07:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c4dded1640e1f66ae36e222e5a8a2fb5 SHA-1: fba511637f2de96117c9d039bb849416623c43da SHA-256: 37b1f0c11f06cde9074f4d6b74fae3663e201fc7226404989b20ccf24173bfa7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

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://soxebez.ru/award?keyword=la+chute+albert+camus+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471275/normal_600d19d929940.pdfIn PDF document text
    • http://usejus.pro/arabic_keyboard_for_windowsfi3zk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5fd2d0d162547.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/supesedesademe.pdfIn PDF document text
    • http://kokilubowo.22web.org/arcgis_image_server_10._5_installation_guide.pdfIn PDF document text
    • http://beautysss.site/how_to_do_a_force_reset_on_iphoneek6ko.pdfIn PDF document text
    • http://rawotanu.iblogger.org/gilgamesh_stephen_mitchell_ebook.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/42788423983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawuvotatu.rf.gd/28479422434.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_c139c4c3da8348e4b354e8ac5e356d31.pdf?index=trueIn PDF document text
    • http://gebejofokim.rf.gd/inequalities_word_problem_worksheet_kuta.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_bd05a9da09364d5e84f5858c7942c8d9.pdf?index=trueIn PDF document text
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_b781e2708c3d443786011554875eff5e.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_b858034023c643d39dcf3f1a9e565291.pdf?index=trueIn PDF document text
    • http://tepusijanakigat.epizy.com/19525595179.pdfIn PDF document text
    • http://zizajurowetomej.epizy.com/rotedevaranikekuti.pdfIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_5ed121b16db748bfbbb6c911bd156f3b.pdf?index=trueIn PDF document text
    • http://risewoririti.epizy.com/bejowajetupudosu.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/afm_in_zimbabwe_constitution_download.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_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 5568 bytes
SHA-256: 22d5b338d5b06b7bae23049691615c8ec9620d69261a97c8fba6b1e6bafe3a09
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 11660 bytes
SHA-256: cebcdd1e91384b4fa32a9ae04f2aa5664959464a560731d2937f95b81e44f2ca

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