Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d846255aec9d3…

MALICIOUS

PDF

73.6 KB Created: 2021-07-17 01:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9340c9c78ac7aab9bd71aa4cb09478c6 SHA-1: 829f97a28941224407132aae92d59f3a591ff7ac SHA-256: b64d846255aec9d3e9e564f8b695d9256559900bf2c83fd18b628eb49bcf56fe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier indicating maliciousness. The presence of embedded URIs, even if some resolve to benign content, suggests an attempt to lure the user to external resources. The file's structure and detection patterns are consistent with a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7882

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/~3/0YvHz_IItD0/square?utm_term=stencil+face+drawing
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec94e39cb57f380a790c69/1626117347693/movie_quizzes_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee7b86fc191471fc6fdd26/1626241926974/bevib.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1f7d7bad1536f43d6090e/1626470359280/tortillas_and_cream_cheese.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee08937dee9f188f743e17/1626212499696/patient_confidentiality_meaning.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 16792 bytes
font_01_sfnt_off0000daed.bin
c275032fdd9c9d8b126e5368d6c272e49ea6c6631f07fccd3a4f3e7250141539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 15568 bytes
font_02_sfnt_off000102ba.bin
0736ef1584d5654096dceefb434e757d4cc2a2ce2295aaae2267e5f0eafd56b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 10524 bytes

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