Malicious PDF — malware analysis report

Static analysis result for SHA-256 745e0def064c1799…

MALICIOUS

PDF

74.6 KB Created: 2021-03-19 20:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9604dbe42a8dc1884f9520cb4da9b999 SHA-1: 92f00e2c0ef2724d2ca4d0b72c8e6eb096b20d90 SHA-256: 745e0def064c17995f58e5dd12041714a00651637242b94b65aec57149fad56e
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO poisoning tactic to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=free+download+pdf+to+excel+converter
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/zezerimezobaviwotij.pdf
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/bafib.pdf
    • http://xejopegig.mypressonline.com/31933478966.pdf
    • http://nazorizuz.medianewsonline.com/pdf_file_merger_splitter_online.pdf
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/07614f982.pdf
    • http://gebikomuxe.getenjoyment.net/vapojosagevofekazo.pdf
    • http://erse.xyz/36030362798ah092.pdf
    • http://wudazex.sportsontheweb.net/wofisapipifupikoguxa.pdf
    • http://waranijovuv.sportsontheweb.net/equity_capital_markets.pdf
    • http://mimivamefigupe.sportsontheweb.net/list_of_books_to_read_before_you_die.pdf
    • http://apparently-home.com/us_work_permit_application_formg28fp.pdf
    • http://joritirumag.mypressonline.com/motorola_cp200_service_manual.pdf
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/916a1ea2b93eb.pdf
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/nenewuna_popof_wokipinenemabol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b26a465d-9879-439d-b03f-e8b5f204b80c/zugiwosubazurufiropud.pdf
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_a5b8003a902b4089a137ac599aa6b8d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fab9c06-8d0a-4fe9-9dde-9576090bf3f6/c_graphics_tutorial_free_download.pdf
    • https://uploads.strikinglycdn.com/files/37790af7-effb-4a96-8b11-634987923cd7/wusix.pdf
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_33e5d4acf88a4c4d896a2764839452dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8fb91931-0c7e-44dd-aeb6-32896bf215b7/adivina_quien_soy_juego_para_nios.pdf
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_48fc2b8af254470a825b606686372225.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_off0000e80d.bin
200e726c9535a9ae1267a137564df156065f874bfd9fdc0b300c37bd05714bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 5148 bytes
font_01_sfnt_off0000f9be.bin
6601c9791baa62c2a334aa0d5a7312107bb64bb327f908ae5e23ec11b85525f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10308 bytes

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