Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3d79abecb0e29d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-19 22:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e71287ce2ac314234fd051ce64830b4 SHA-1: 52e71e7572690701032dd2b6575b2b6e6286dce8 SHA-256: 5c3d79abecb0e29d6f21d886dd7209266445c79e7094c79058432c779b46e42a
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, including one pointing to 'zajinet.ru', suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support that this document is part of a campaign to drive traffic to various disposable hosting sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=descartes+meditations+1+and+2
    • https://cdn.sqhk.co/wakewafo/ivgcih9/wujerevabaj.pdf
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/pizur.pdf
    • http://vukizupejudula.22web.org/career_paths_tourism_teacher_book.pdf
    • http://pakirekugep.scienceontheweb.net/21948662452.pdf
    • http://xegazinijitup.mywebcommunity.org/kibigorujubuxenif.pdf
    • http://boguzimaro.getenjoyment.net/assets_and_liabilities.pdf
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/6849324.pdf
    • http://xokebidukefu.getenjoyment.net/como_hacer_bases_de_datos_en_excel.pdf
    • http://lozuzaragujeb.mypressonline.com/clases_de_ingles_basico_para_nios.pdf
    • https://cdn.sqhk.co/zirigajer/lZuOVgj/hang_gliding_cost.pdf
    • https://lapedifulijep.weebly.com/uploads/1/3/0/7/130739603/gufama-wesuxekusaruj-goxag.pdf
    • https://cdn.sqhk.co/pilimisoduk/eu7jghi/47382651637.pdf
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdf
    • https://cdn.sqhk.co/wakewafo/jdihjas/agent_orange_strain_allbud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vepitejususas.atwebpages.com/how_to_manually_eject_disc_ps4_slim.pdf
    • http://mevodazef.epizy.com/belajar_bahasa_inggris_sehari_hari.pdf
    • https://uploads.strikinglycdn.com/files/88e45766-1031-488d-813b-393003c62e74/dozotojijutim.pdf
    • https://uploads.strikinglycdn.com/files/010261a3-dc94-4d62-bafc-4243c83bc4fd/legend_marie_lu_ita.pdf
    • https://uploads.strikinglycdn.com/files/c484f947-ae19-4052-a0c7-3026060a6496/wisubozogejafapujetuja.pdf
    • http://ligoroxenafof.atwebpages.com/72736359299.pdf
    • http://xovanesoku.epizy.com/why_monitor_is_not_turning_on_with_computer.pdf
    • https://uploads.strikinglycdn.com/files/1e84151c-31d6-4c09-8f74-ec05d65e8476/how_to_repair_sprinkler_pipe_surrounded_by_tree_roots.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_off0000edb3.bin
385250faa1dbf8fbba3d76ad5de4f3a8a1ae0c876c04cec32e0044a4ead6f74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5236 bytes
font_01_sfnt_off0000ff74.bin
2df58202200930cca1a6dc5d8e08e0b9edc605169dd23f9331b206dec85b9700		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 10088 bytes

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