Malicious PDF — malware analysis report

Static analysis result for SHA-256 190cdd1ce20405af…

MALICIOUS

PDF

77.5 KB Created: 2021-04-08 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 919bf196157c07630b275a9cecf60b81 SHA-1: d3f0e940ef8d1bf7e78eecb67d261d980582f645 SHA-256: 190cdd1ce20405afa18bb4658aa1e08ebcb46625f82d8ff74fd3ebd7f0ef8dc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=filtering+data+in+excel+sheet
    • http://desawigoxikugaw.mywebcommunity.org/water_borne_diseases_and_their_prevention.pdf
    • https://cdn.sqhk.co/kavuweduti/gi7Pdt8/raroxudujafipotiginotus.pdf
    • http://arfesopt.com/what_is_the_meaning_of_beyond_the_veil0b6nt.pdf
    • http://datab.vip/dd_3.5_rules_compendium_downloady2xft.pdf
    • https://cdn.sqhk.co/girasufu/yfgfVia/fagunuxu.pdf
    • http://demask.fun/rolavosijeze8bmha.pdf
    • https://cdn.sqhk.co/samofetob/azijgiL/poteze.pdf
    • http://clubstore.pro/integration_of_x_square_cos_inverse_x_dxh8727.pdf
    • https://cdn.sqhk.co/satijumok/hjriglI/bunaseno.pdf
    • https://cdn.sqhk.co/ranetixeba/ifiigja/sibelebunidu.pdf
    • https://cdn.sqhk.co/fufigavaki/Varjihb/49372428538.pdf
    • https://cdn.sqhk.co/lutumodigi/i87ePrM/school_days_visual_novel_steam.pdf
    • http://lapiwudoxavov.scienceontheweb.net/24179634818.pdf
    • http://gsmall.space/the_complete_guide_to_tarotz65n2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_2fd246f4d8fa41bfa32d10d18534ee12.pdf?index=true
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_b3f98cca5f1b454c883b5a9e5258d63f.pdf?index=true
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_d8c78370526f469c95342d1e69a5ae96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ab02cbc-bda4-41d5-b201-8ed30b8daf3b/john_deere_950_cultimulcher_parts.pdf
    • http://vidugozu.atwebpages.com/c_advanced_interview_questions.pdf
    • https://uploads.strikinglycdn.com/files/2c34d0a7-b066-4ca7-801a-c11695656cdc/how_much_does_an_api_510_inspector_make.pdf
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_e5b776ef0d8f43b3af6e2cac1b1debd0.pdf?index=true
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_2571bc1727474f1e9096f7f5ba17f1c4.pdf?index=true
    • 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_off0000f095.bin
b74fe4c65400e753a6f78fbd8ab1094916d4eae49f8c7d4308313f3056e1854e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 5224 bytes
font_01_sfnt_off0001025a.bin
02adb4c5a9001276e7b69c409905d6def0622a6a811260fd5e16ec756c954e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 11176 bytes

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