Malicious PDF — malware analysis report

Static analysis result for SHA-256 e681e3a533a1655d…

MALICIOUS

PDF

77.5 KB Created: 2021-04-02 15:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5bf33ddb7c404fc1112b38f481881ae SHA-1: 77e978098c038305ae86d14e854b62968f4b693c SHA-256: e681e3a533a1655dba5f21c4aded695da29624ff7469809795612ed2607efc4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. One of the primary URLs identified is https://jumiwimov.ru/strik, which is likely used to redirect users to a malicious site. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=arte+mayor+concepto+y+ejemplo
    • http://fizarumokugafu.mywebcommunity.org/pdf_file_software_download_for_pc_windows_7.pdf
    • https://static.s123-cdn-static.com/uploads/4486192/normal_5fdf81608fe72.pdf
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/tuderaretureferesad.pdf
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/f0add3c.pdf
    • https://cdn-cms.f-static.net/uploads/4489839/normal_603beb1b525fb.pdf
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/594452.pdf
    • http://kewatupu.scienceontheweb.net/did_bruce_lee_have_a_daughter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zodawanuror/cashflow_101_board_game.pdf
    • https://s3.amazonaws.com/votubukaxogilix/how_can_i_check_my_business_credit_score_free.pdf
    • https://s3.amazonaws.com/xijalovelokolep/lemony_snicket_series_of_unfortunate_events_books.pdf
    • https://s3.amazonaws.com/xupimaral/77658809245.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_9a4cc5a3fffb42b9a2658e1bd633ad92.pdf?index=true
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_63b7edaf28154dc5a1fb169386ec8388.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_9d037d7f35d94d2fba5fa74bab092cf7.pdf?index=true
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_da460982c23242a6b7a88fa6c119990d.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_off0000ee4f.bin
b75b135179bbff7c36de1524fdfbeea6abdfdd6c5f49baa93f1794a193912cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5068 bytes
font_01_sfnt_off0000ff83.bin
46e6b0c036c23123d5420bfc17d59cbc179be803f856a77e0b9472499a95baad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 12296 bytes

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