Malicious PDF — malware analysis report

Static analysis result for SHA-256 e238abf12f552bea…

MALICIOUS

PDF

75.5 KB Created: 2021-07-20 20:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba9b3602a82b65c88c40b0cfeb9ccf72 SHA-1: 2b188b80f7ad2554e64591dd2a01abf346d8bbec SHA-256: e238abf12f552beabd63eaec1fff76ec2479d08cf8cf8194b1fd344139c53626
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a malicious phishing attempt. The PDF contains embedded URLs, some of which point to benign resources, but the overall detection suggests malicious intent. The presence of PDF-specific heuristics and the ClamAV signature point towards an exploit targeting PDF viewers.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/IdU8rIDf9lQ/square?utm_term=types+of+geomorphic+systems
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c9129ffc3426e8a4b36f/1625868562409/report_sample_for_students.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f277579dfa584dc9d6137e/1626502999213/bugalivevala.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_off0000c78b.bin
cdddd4dd915f965ca11859d7166f49b662bfdf849f292ddefcf210d4f5b6f1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 16312 bytes
font_01_sfnt_off0000f1ef.bin
4026796395f5c71c89665ae602a9a4d83c47218bc9d419e158a7048e09890600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 10692 bytes
font_02_sfnt_off00010a8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 16792 bytes

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