Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0610af5b6095b3c…

MALICIOUS

PDF

66.5 KB Created: 2021-02-03 13:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cc6855625ff3be9f3b3cd9d4d6feccd1 SHA-1: fdf8b520b0a2ce2204bb62f923f8eb7314ca138a SHA-256: b0610af5b6095b3cea8ff1e17dad1f7d15c7ed7a3493f86b68475c95d992c617
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains an embedded URI pointing to 'https://seumenha.ru/123?utm_term=buck+institute+pbl+presentation+rubric', which is likely a phishing lure. The presence of a visual download button further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/123?utm_term=buck+institute+pbl+presentation+rubric PDF link annotation
    • http://fogozuvonuw.66ghz.com/the_yellow_wallpaper_multiple_choice_questions_answers.pdfIn PDF document text
    • http://vuvuga.xyz/4411188131404mrw.pdfIn PDF document text
    • http://bachanalytics.com/la_boite_a_merveille_en_arabe_et_francaisjctyp.pdfIn PDF document text
    • http://lumacy.site/sojoborowenumogefogavaga8yf5t.pdfIn PDF document text
    • http://orbitan.fun/wuwejofifoloseha0z.pdfIn PDF document text
    • http://conicppjry.bid/guludefuzujibamuscie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafalemanam.epizy.com/gakitera.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/60615744343.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/zipifedexipuj.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/28486731282.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/mukobimebig.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/19966157163.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/99199740672.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/fafugudoxumitirasu.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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 5180 bytes
SHA-256: 867e072c00c6ae2e228a408c89b5e6e5a1c935bd3766aba45405aa2fc110a974
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 10144 bytes
SHA-256: f265d9d0176df99a9f83ede7c09d62af86165963465adb840cec7d2ab131b4ae

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