Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ae48b5356cdbff…

MALICIOUS

PDF

72.9 KB Created: 2021-07-14 01:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 140116236fcdc893e887ac78eb22adac SHA-1: 6d994760455428c8c912f6f800d367cb49add45a SHA-256: c0ae48b5356cdbff684d9ffbcc46eb52cd186e31e6b7a16038fc72cfcffabd06
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. An external URI was found embedded in the document's metadata, suggesting a phishing attempt to redirect the user to a potentially malicious site. No scripts were extracted, but the presence of embedded URLs and the detection results point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6193

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://feedproxy.google.com/~r/sq/ugae/~3/5VO7y1TeAqQ/square?utm_term=distributing+food+to+the+poor PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9328ce6bd1231e60877cd/1625895564647/interview_questions_on_javascript.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7a4fc69e16759cf72c361/1625793788974/normal_wbc_for_dogs.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd24b2e8a4a2aca789812/1626198603698/all_angles_of_parallel_lines.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec892bdd2ac847ff7f29fc/1626114347355/problems_and_solutions_on_electromagnetism.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 15692 bytes
SHA-256: 155ed60c1b0793dcbf4f712f1f316442c0b7cd7af9d9e479b087a4ed0be3b7c4
font_02_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 10808 bytes
SHA-256: ed446515b1e8e98d7fea4ebe5d06921a4ac541a58704b352b3a1b7e84eefb0dc

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