Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77c2c6003cdff09…

MALICIOUS

PDF

80.7 KB Created: 2021-07-12 23:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6755cfa31db1a8b8e935f434a847ca5d SHA-1: 933a35ccc8e6c68e3766c278d092779d7591ba61 SHA-256: c77c2c6003cdff0931ce539e85df3d21961af40b3bf3b17047dfb07e31265072
96 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains embedded URLs that likely serve as lures or downloaders for further malicious content. The PDF structure itself appears to be exploited, suggesting an attempt to execute code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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/rCno-htTzZk/square?utm_term=how+to+make+brown+colour+in+watercolour
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7b1b9ed7e63043961d1a6/1625797049348/what_does_dilation_mean_in_geometry.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7b6508f757b1ac44f94bc/1625798224860/which_waves_transfer_energy.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7b825dbb92d34f5ace702/1625798693344/60065993927.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e89abd4f7f922498901eb4/1625856701441/xifivarojewit.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e785713cef58512b1cc395/1625785713364/the_mixed_up_chameleon_coloring_page.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c24ae534972f7b79b9d7/1625866827029/kikerusivegu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91464defa333328aa105f/1625887845047/rarakofetomegubavugoxe.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e82a766e46386ca3c3da6e/1625827958382/grey_literature_meaning.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_off0000d7c9.bin
325ac70311041251ae08aaacc15dbf37bd32b0d2dd60f78fd7767fd878ee6e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10632 bytes
font_01_sfnt_off0000f00d.bin
9254e48012ecdc5d8a4075cc36086429fe5f0cbadc5ff250929c0980b71c39d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 17644 bytes
font_02_sfnt_off00011e96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes

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