Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b37d897971e971…

MALICIOUS

PDF

76.8 KB Created: 2021-07-15 21:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58dd8f06fd202d4ffea610f33866f871 SHA-1: cf1a5ccc08ddf07f6bb7c573a662b0902fa35cee SHA-256: f7b37d897971e971e49dd32bf71dfbee041670cdc8852aed2752a6e1065abac0
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 a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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/eoPDrVzwpx0/square?utm_term=best+berry+crumble
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e94866c0906550d90c75a7/1625901158132/kobolerupuru.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec72fa82b4c978cf3fe01f/1626108666417/bapujonij.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efddc549582827e2fc3394/1626332613779/xinesewidafifokifu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec786af89f8e700bf65244/1626110058663/what_are_all_the_capitals_of_canada.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94218c91b61347ea4a72f/1625899544606/beauty_and_the_beast_brothers_grimm.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_off0000c95c.bin
445f914c6b092fac078205d0d1c940ba001f694389d7aeeae7b16e4cf19323bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 10320 bytes
font_01_sfnt_off0000e0c9.bin
0c4634a970118fe8797579ac487085692e3c69f3e5fc0bcc5b1d69f791e6738f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 17612 bytes
font_02_sfnt_off00010fb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 16792 bytes

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