Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8d0b1405dea47d…

MALICIOUS

PDF

74.2 KB Created: 2021-07-13 01:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fa1e397184085b274c901117b5f4bea SHA-1: c391ebce278b373d8984dfedd6be979fb7f75aa8 SHA-256: ca8d0b1405dea47d7a7b23facc6447ed9153a704b40e5281b49d497eb1119faa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests a potential for phishing or redirection to malicious sites. The wkhtmltopdf authoring application and the corrupted document body suggest the PDF may be a wrapper for malicious content or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/nCRFBnYrBHY/square?utm_term=two+queens+in+chess
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e86e4d419c280ea9acb5c4/1625845325668/animal_farm_by_george_orwell_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb5b175d4e371f32864f6/1626125745350/jojesawa.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecb225ad57c8233657a52a/1626124838224/vefotazageberiw.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_off0000c300.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 16792 bytes
font_01_sfnt_off0000db17.bin
0372f529ca279ae1f763ea90b515c159a6f07033d4befe66f28a69bd26db11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10216 bytes
font_02_sfnt_off0000f1fd.bin
ed3cbff4d2a53bbe14729716586a8c68e9edfb308c450e9bf447008eee6f5e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16796 bytes

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