Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a891f850ce3d14…

MALICIOUS

PDF

85.7 KB Created: 2021-03-20 09:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40ac8cbe8e20e9b7eaa82a250bdf1476 SHA-1: eb6b0e14501aef3c26816bed43ee7ce291974424 SHA-256: e3a891f850ce3d1474872e43faf1af5797738aed040bdc6af585597c0d7c4152
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. The document body contains garbled text but the heuristics indicate it's a link farm with urgency lures, suggesting a phishing attempt. The embedded URLs point to disposable hosting, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/strik?utm_term=how+much+does+a+surgical+nurse+make
    • http://vetodegaro.22web.org/cheat_sheet_java_collections.pdf
    • http://jokebixa.22web.org/90373269590.pdf
    • http://zawoxilejaku.66ghz.com/dufinivonewodimo.pdf
    • http://lojasamericanasbr.com/83734812484031rx.pdf
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/vireriginokogi.pdf
    • http://goshop32.site/53237336849qvcoa.pdf
    • http://coins24h.com/baserumiwumegemuxetumixu729ge.pdf
    • http://wibimozuj.22web.org/appraisal_form_filling_tips.pdf
    • http://wavulefarunatev.iblogger.org/piwarotuxijuxix.pdf
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/4545988.pdf
    • http://dimax-matrasy.ru/ratilaxutovitexibuti5fwi.pdf
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/dupabavi.pdf
    • http://vimoroketoburiv.22web.org/developing_tactics_for_listening_third_edition_free_download.pdf
    • http://terugate.mypressonline.com/97884535513.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wazinupizut.epizy.com/printable_kindergarten_worksheets_free_download.pdf
    • http://besosive.epizy.com/el_principe_de_nicolas_maquiavelo_completo.pdf
    • http://weferobiditikun.epizy.com/kvs_ldc_answer_key_2020.pdf
    • http://kojajopi.epizy.com/excel_spreadsheet_template_for_medical_expenses.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_f7df4e09aca7498c8ef53f895c592bb8.pdf?index=true
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_9e9099347a7545cbabeb4feada9547e0.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_f32d9dd6a99c42739013ff74cc4c343d.pdf?index=true
    • http://sudexixurijaxoz.atwebpages.com/pomarolaxasijosi.pdf
    • http://lodumojokexiku.onlinewebshop.net/webewuziluwufatofi.pdf
    • http://bexexakik.myartsonline.com/xapategasivofivonixajudij.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_off0001113b.bin
6bac431ee86fef9845d0fb1ba393064c5ce6d5fd6788b616cd7e9bc34289708f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 5468 bytes
font_01_sfnt_off000123b9.bin
67d4610d1be134079bcb6358e65f2f0d2c01a7d458283778d08f1f9c046af8eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 10844 bytes

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