Malicious PDF — malware analysis report

Static analysis result for SHA-256 da34d7eeb7efc732…

MALICIOUS

PDF

100.2 KB Created: 2021-07-13 15:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266d4f62d59e4ab950c1738b82f5896e SHA-1: 2afe10172437e506bf8e7e251de8fab2f5d65c56 SHA-256: da34d7eeb7efc732ef72d41a6442786eb0c8e661538d859830c226ab5a0f63f6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or exploit-laden PDF. The presence of embedded URLs, though labeled benign, suggests an attempt to lure users to external resources. The malformed document body and PDF-specific heuristics further support its malicious nature, likely exploiting PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7883

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/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=graphing+linear+inequalities+calculator
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec99289a1cf201f8068a08/1626118440660/lord_of_the_rings_3rd_age.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7737c651fad09a6667281/1625781116889/bsc_actuarial_science.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7994a86d8930991a28f1f/1625790794328/the_lusty_argonian_maid_book_full.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e86901de876b5fc8bbbe7b/1625843969395/63586308856.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e777b76071824dd44f88f1/1625782199754/one_example_of_a_simile.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed886dff6d86145ba1ab81/1626179693516/well_done_definition.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_off00012654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 16792 bytes
font_01_sfnt_off00013e6b.bin
2638ac655c8ddb369d737b3b13ff0b348081f4e173b72373129ffa371fb55b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6B 10940 bytes
font_02_sfnt_off00015766.bin
cda9f6cbee6ee4f19ab52fa5ae8ae411c8ecaf7d5bffb8ea3b73ddb9beef0e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15766 17236 bytes

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