Malicious PDF — malware analysis report

Static analysis result for SHA-256 b782478549c32f19…

MALICIOUS

PDF

78.4 KB Created: 2021-07-12 21:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 149b7abc2790d15bc4f8e5486031b7c4 SHA-1: cbbac1e0b6407a0b3ff6cf2c299afe31dc10c763 SHA-256: b782478549c32f19e362b8866ab2c7dac9a90ac591868d98572cd073530843b1
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are confirmed benign, suggests a potential for phishing or redirection to malicious sites. The file's structure and heuristics point towards an exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/nCRFBnYrBHY/square?utm_term=parts+of+microscope+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e79487d93aeb546a104862/1625789575515/80307637319.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7e1d625441e1b3786405b/1625809366540/peritubal_adhesions_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e9967baa26076bb4925/1626111642208/paid_repossession_on_credit.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d5794072d952528f0e66/1625871737545/scooby_doo_first_frights_ps2.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_off0000d040.bin
7692e1268f3f27c5126b92efd700ee7fd1c26db18059c601df5fd5f571fda3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 17252 bytes
font_01_sfnt_off0000fda3.bin
25f7c225044cddaf7480351c3b7db6869e8773b5fbf16a06a7bec0f1c58b84ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 10632 bytes
font_02_sfnt_off00011607.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 16792 bytes

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