Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdf6305d83a624d…

MALICIOUS

PDF

59.9 KB Created: 2020-12-18 03:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd6d59f223aa750be58514ff4edcd12d SHA-1: 13071ebbc53a6e74d4643a55dbb8006867a05244 SHA-256: 7bdf6305d83a624d95bf5a5b688b3cbf140d65acbacb7cf0fe5b529b9f3633c3
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, and the document body, though heavily obfuscated, contains text related to exam answers. The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing attempt to redirect users to the provided URL. No scripts were extracted, but the presence of an external URI and the overall detection profile suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://traffine.ru/strik?utm_term=the+crucible+final+exam+multiple+choice+version+answers
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5faa63bd7fe28.pdf
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fa88c03bfe6e.pdf
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fd666267e97d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc12ec9f7cf8c75402cc175/t/5fc2f6f49d79364840f00491/1606612725045/in_search_of_the_temple.pdf
    • https://s3.amazonaws.com/davubewu/posasunonadajujafagomopox.pdf
    • https://uploads.strikinglycdn.com/files/537fa68a-ced7-4eed-90cc-07169652f14b/round_hill_elementary_school_principal.pdf
    • https://static1.squarespace.com/static/5fc29fd4c14dfd36fefc97f1/t/5fccc2d405ddc9599d1eecfc/1607254743338/john_gba_lite_how_to_use.pdf
    • https://s3.amazonaws.com/jolunenafobuw/tusovukelo.pdf
    • https://uploads.strikinglycdn.com/files/b7cf3400-99b1-41d7-b01c-215cc135af80/66493607607.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf6632dd96f5918b3d00e/1606284900460/el_principe_resumen.pdf
    • https://uploads.strikinglycdn.com/files/555012fb-9b87-401a-85c6-ae4e1e96de6d/22108842020.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_off0000ae42.bin
5479769e6545dbac5b63c97ca551c80b9f014914ac48b3f7721e456c468b8189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 5564 bytes
font_01_sfnt_off0000c114.bin
39effeadd21881ac88339184dcca64c7a6aabd455c344a397c4084b622f984cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC114 9768 bytes

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