Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d8d404701c99e8…

MALICIOUS

PDF

75.1 KB Created: 2021-07-17 18:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d69f8f166565ecc03087ea4459bb666e SHA-1: 4e9a4ccc34239bee5f785abbca1bfdbff06ba726 SHA-256: 78d8d404701c99e8669d07f1bbadb9ccd064a703d9f615decbdfa13254eaf3a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs that likely lead to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious resource, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/jEScUJLm1bs/square?utm_term=coffee+and+liver
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eda69e5e50ea0df8e0f8c3/1626187422494/51106951710.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee2d57b82b3047685f1b1a/1626221911242/romatofumosozedutunu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec86705f604029b991d3f5/1626113648538/books_on_business_administration.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f146fcadf71e7547ce3ea0/1626425084683/23026502162.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e928780cbdad4d3506154e/1625892984074/ruwixosiwugisevaw.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e85c44700af648fd121a90/1625840708183/code_of_ethics_for_nurses_with_interpretive_statements_free.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8eda44349d7bb06d2e79/1626115802733/define_lewis_acid_and_base_with_example.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f01ed3e9d3bc6103febd19/1626349267177/are_monounsaturated_fats_bad.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e92a865fa2eb14b90c1af4/1625893510398/23135605455.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f23dea0a88cb63e5be9383/1626488298958/64106316206.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f23e464b68c137e690dcd8/1626488390292/jedufoxarulemid.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e873ae3ebe920a78351e50/1625846702116/board_review_from_medscape.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_off0000c6e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E3 16792 bytes
font_01_sfnt_off0000defa.bin
789df1f1cd5609dbff4d0126e8b12910671ef63dcca39b708f617e750fb5f55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 10176 bytes
font_02_sfnt_off0000f5e0.bin
9b0f990bac6da8e779583c5e1797055563bb5fcf370444fec2c9e16d55d5fb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 16428 bytes

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