Malicious PDF — malware analysis report

Static analysis result for SHA-256 39455bd7cbf353be…

MALICIOUS

PDF

76.4 KB Created: 2021-07-15 15:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79832900a114e0716d0edac2eba94c8d SHA-1: e5b229167655479a4af9dcbec8b224d4bc1c4ecd SHA-256: 39455bd7cbf353be339b04abd7dfc0913df5ad38ab823fb30b0d10c6fc3122b7
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs, though many are confirmed benign, suggests a potential vector for further compromise. The PDF structure itself contains elements that triggered heuristics related to external URIs and duplicate object bodies, which can be indicative of obfuscation or exploit delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3002

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/UQ8tT55rDuk/square?utm_term=past+perfect+simple+worksheet
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f01f3639c5d52effb7d9a9/1626349366684/small_comprehension_passages_for_grade_1.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecac2ef4b4775d04a33216/1626123310101/used_to_exercises_with_pictures.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_off0000c7cf.bin
6ba32854da5b7fa8437d727563c547a98eafb7ef5ad932d0ca2b6a3d8b750e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 10820 bytes
font_01_sfnt_off0000e0de.bin
bc20d55cfbcdca7603237e4b93f96ba64f06ad5bc25ebaf9d04fc2be98e745e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16684 bytes
font_02_sfnt_off00010c68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 16792 bytes

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