Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27a538b7b645b8…

MALICIOUS

PDF

77.5 KB Created: 2021-07-15 23:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1e33a6b0a709ad1c4854f5833e0c3c3 SHA-1: 76e83251e4765368392037cfcf3e15ec8eadf985 SHA-256: da27a538b7b645b882e7832abcf21a9215093a450e6c587820fc01f414b43053
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as a phishing trojan. While the document body is heavily obfuscated and unreadable, the presence of embedded URLs and the ClamAV detection strongly suggest malicious intent. The file likely attempts to lure the user into clicking a link or exploiting a vulnerability to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/razvivatel/yapz/~3/UQ8tT55rDuk/square?utm_term=kittens+for+sale+pitsea
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f06ab1be875f230106793b/1626368689978/57267673714.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee27c75f7927514e3bad0e/1626220488107/thin_umbilical_cord.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_off0000cf70.bin
21fe64908661822575147a788f382569eceb801b54a17780939258e8d959e4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 16704 bytes
font_01_sfnt_off0000fb1a.bin
09d7c4baebaf270991568eeb7cf97b902d4120d7fcb7878632b1fd22fbb4f92c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10344 bytes
font_02_sfnt_off00011295.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 16792 bytes

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