Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ef3672985855c6…

MALICIOUS

PDF

78.7 KB Created: 2021-02-16 10:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ad630c1783256cce42e22374734b206 SHA-1: 9e9c2c4470b6b0151b880af91f42e41dc51363a9 SHA-256: c5ef3672985855c68bcf091740ed8f719c2673e44acecbde9f3edc164b50ddee
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a scholarship opportunity, directing users to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crophysi.ru/wix?keyword=nj+scholarships+2020 In PDF document text
    • http://b0xberry.online/1307694805gnzcv.pdfIn PDF document text
    • http://koteyarn.moscow/41444155182mylj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_601d5a5bade4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaligapuk.epizy.com/99510158283.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/play_scrabble_online_for_free_without_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/40508814215.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/12343791015.pdfIn PDF document text
    • http://jugikan.epizy.com/audit_trail_report_quickbooks_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/dementia_treatment_nice_guidelines.pdfIn PDF document text
    • http://kesexawes.rf.gd/juverir.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/my_valentine_english_song.pdfIn PDF document text
    • http://jibogifimot.epizy.com/19962683101.pdfIn PDF document text
    • http://ruzojonawa.epizy.com/korean_face_sheet_masks.pdfIn PDF document text
    • http://nevurewajarip.epizy.com/dr_aidin_salih.pdfIn 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_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 5340 bytes
SHA-256: 997b707a918a86169c3b0a3d2b6ddae9416db02240d67625f91eefb5e50a4c18
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 10872 bytes
SHA-256: 91784c4ed179819f66b15ac429ce95a2960e26ed1f7a5300163103ec3b69a478

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