Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b70031985e458f…

MALICIOUS

PDF

92.4 KB Created: 2021-07-13 15:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb6f70518682423427417656ab28d2b1 SHA-1: 28370b8c52eda792379ab225de2e71c8d3d3eb27 SHA-256: 90b70031985e458fd0be6bd0f78d034fc8bf5dba36fbbb007b5e0cb602ddd925
66 Risk Score

Malware Insights

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

The ClamAV heuristic 'Pdf.Phishing.Trojan' strongly indicates a phishing and trojanized PDF. The presence of embedded URLs, even if currently flagged as benign, suggests an attempt to redirect the user to malicious content. The file's structure and the 'unknown_exploit_score' point towards exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.1532

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/CcIy6vlvkUk/square?utm_term=chicago+style+footnote+generator
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e835b85c1b846003427a1b/1625830840764/book_of_the_dun_cow.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_off00010795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 16792 bytes
font_01_sfnt_off00011fa7.bin
e73f809d533ea675ca0c5543ea6208baf08c6ec08ad67a47f695ae4ae4c8f68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 17344 bytes
font_02_sfnt_off00014d59.bin
b03550896977cdcfbd3a0e68bcfdab40120f5423630221c3a4a4305534a70e95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 10760 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.