Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a780f8a2d764181…

MALICIOUS

PDF

97.2 KB Created: 2021-07-14 02:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 494b491e749a6f6655da2104f2d595f2 SHA-1: 9e26865e328f63b741cf1cf63d88a3950a01c21b SHA-256: 2a780f8a2d7641813bc977d895c79136fc50fb0321db9cace4f3621a78948fa8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, although many are marked as benign, suggests a phishing attempt. The PDF structure also contains duplicate object bodies, which can be used to obfuscate malicious content. No scripts were extracted, but the overall structure and detection indicate a malicious intent, likely to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3296

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/AnJPYMJXbyQ/square?utm_term=examples+of+adding+and+subtracting+integers
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e774fd1bd7543d7b5bc00c/1625781501606/comedy_central_roast_of_roseanne.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9325d566ded7d61ad506c/1625895517553/purereralaki.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8ee62b132fa362070d9b8/1625878114935/segurodorejijanopabe.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee10e5f6c772366d2a8367/1626214630039/duxodetejupup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f5.bin
b5c11f41312326fba73356c1df9c6c5a852eb08a71fb13cb711e14ba2ce4db19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 11288 bytes
font_01_sfnt_off00011b09.bin
21ff46de98f0902b53a5c0c946916a1dd4551bbaa4204463728281c4bc54dda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 16088 bytes
font_02_sfnt_off0001303d.bin
3f8e5fa0b961671347e1fd83752e08602e078a4e9c2430d84245f2471103d3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 18060 bytes
font_03_sfnt_off00015ff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF0 16792 bytes

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