Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdecb21f7377cbee…

MALICIOUS

PDF

71.8 KB Created: 2021-04-23 07:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b5e43f3232b8ec7e59a05ceaeb623c0a SHA-1: 65d48f0f75a82bd2d8208bf3419ec1c285589fd9 SHA-256: bdecb21f7377cbee5a07ab0df4cdc9f046a8c129fa36722d9a58100453f09406
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'dafemum.ru'. Another critical heuristic indicates a PDF link farm, suggesting the document's primary purpose is to direct users to external, potentially malicious, sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+logic+of+god+amazon In PDF document text
    • http://dopogabijup.mywebcommunity.org/amar_boi_class_2_download.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/mozib.pdfIn PDF document text
    • http://nososunovurosag.iblogger.org/50844753007.pdfIn PDF document text
    • http://zafikapasipugog.medianewsonline.com/tcs_email_writing_questions_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a00f52-8517-4f9c-8635-087b970f3cf6/57060924337.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/migonozubofurifivizize.pdfIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_70e2d7dae79940abb59b722b7f5ce730.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_4bf2fe2fddc348349c0d6964dd2356ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/play_munchkin_card_game_online.pdfIn PDF document text
    • http://fikakoba.rf.gd/59562808287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b111fe-3710-41e3-bbaf-6680e3992963/16524670870.pdfIn PDF document text
    • http://fabevax.myartsonline.com/7209671244.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/audio-technica_at-lp120xusb_manual_direct-drive_turntable.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/heat_exchanger_in_ac_system.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/78916451607.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_9f4183d90a5242549ccf355a8a8fb4d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87910ed9-1f33-4782-9db7-467998a8b7ab/3357050022.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_98cfc2d9f92a441db7de28d0d11332ed.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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 5160 bytes
SHA-256: 75f3f8683c170ab70a22abaaf109df756d1aff6afa5680ce624a3cb8249d98a0
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10008 bytes
SHA-256: c1a9b4d0848e2283a2d1e7d0f332c62e670687bf615f60c4980fad28f6faebcb

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