Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa61d33c5b9585d0…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 10:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a442429f762e8358c4cac25cc06715fe SHA-1: bf9fabd37322658c9abb0009ab4337b824ce73ae SHA-256: fa61d33c5b9585d03a9cd73c36106b2b416c5db68b052c1124352bfa0f0708e2
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', indicating a phishing or trojanized PDF. The presence of embedded URLs, though marked as benign, suggests an attempt to redirect the user or download further malicious content. The 'wkhtmltopdf' authoring application might be used to obfuscate the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=risotto+without+arborio
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e813a8d0799e4214c29243/1625822120238/59891183894.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7a19fe047727940a9a35/1626110489968/show_your_tits.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_off0000ce25.bin
7708b90584601540a5b8a39d1c249374c10fcd9a289733d32e2a6ce45c92258e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 17164 bytes
font_01_sfnt_off0000fac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 16792 bytes
font_02_sfnt_off000112da.bin
ede1aef1fe5ebc2e4b3bc0e4102c84eae341d033dd88ba2af1f2a2d36c7fb7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 10292 bytes

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