Malicious PDF — malware analysis report

Static analysis result for SHA-256 455fe9ecf6f6924c…

MALICIOUS

PDF

80.3 KB Created: 2021-07-12 22:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b519fe245844ac0812768cc61b62fbf9 SHA-1: 624af7bab46955e781a746b0eeb71c894c3a2a13 SHA-256: 455fe9ecf6f6924c872bdc3cc138ef5a5d84d73e39deea6fbaee5d6d1d1318fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8049

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://infrive.ru/square?utm_term=happy+birthday+piano+with+numbers
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7f4e6ad76c09748fc054/1626111822872/boston_terrier_mixed_with_french_bulldog.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec85c00d838b6c850d24b4/1626113472168/life_skills_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec91d91951226b8b8be938/1626116569242/time_to_the_quarter_hour_worksheets.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9363112fb7d0b27941896/1625896497323/tosururop.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e87a77eafd980940738be7/1625848439990/34898522625.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_off0000d542.bin
d0aa412acb40e895b598a43e03d97d3697a66afe8f1b57aba916ee37db46558e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 11040 bytes
font_01_sfnt_off0000ee98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 16792 bytes
font_02_sfnt_off000106aa.bin
66ce41e81f53e57202861dcee7a032a33c48b8bce7598af05744b05533f374eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 17172 bytes

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