Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13ad3d14442061e…

MALICIOUS

PDF

96.9 KB Created: 2021-07-19 18:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a28b189526b204290fa3d3d267e5f68 SHA-1: 903107f18296fb2d03370e882f107ac0c89ddb53 SHA-256: b13ad3d14442061ec3854be0e3c13a3eabcc2fbc70edd04502c83075706dee15
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 trojan delivery mechanism. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further stages. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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/um1bUVUAM38/square?utm_term=quadratic+equation+notes+for+iit+jee+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f26a146d5e991e36d6c984/1626499604863/62578829624.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f512f29471b562af25b535/1626673906809/discrete_event_system_simulation_3rd_edition_free_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e84d16f518dd358f68a23d/1625836822839/flight_from_nyc_to_miami.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4e2bbc2d40e67ec1d132a/1626661563339/dusefedabiwisizope.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f5517f70ff22042a1bdb94/1626689919312/vuguzij.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efde571a40e718905058f4/1626332759663/convert_liters_to_ounces_or_cups.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee27a26d75c50a5d423e3d/1626220450354/revapazijawa.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca938b3b63f0898f585ad/1626122553012/galogafemidesute.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8ff833f195e1e4034f644/1625882499826/93087343558.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c1.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16088 bytes
font_01_sfnt_off00010ef6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 16792 bytes
font_02_sfnt_off00012708.bin
5975b7d08725a21d63bae7267343998a163a0e9a057e074faff81bb48e960c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 19408 bytes
font_03_sfnt_off00015b82.bin
ff02ed02114e2ec5808880716b84408081617fb59081f639421ef9ba4824ef79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B82 11004 bytes

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