Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aaa4a991ca044f1…

MALICIOUS

PDF

85.1 KB Created: 2021-07-15 13:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e1c707d3f62bae197eb832d4168fa88 SHA-1: a466ea5c3c343f1821a75300e7ce145e9d74718c SHA-256: 3aaa4a991ca044f1268c0823c84117154e2ebf2382773bdc96e6dc59989319df
96 Risk Score

Malware Insights

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

The sample was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded URLs, suggesting it is used to lure users to phishing sites or download further malicious content. The `wkhtmltopdf` authoring application and the presence of duplicate objects are suspicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

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/W5vEtEh6t-A/square?utm_term=how+to+address+salary+expectations
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee1d5fe03b615e098bc1db/1626217823515/implantation_after_frozen_embryo_transfer.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec81b04a8bde38c3449fd8/1626112432687/automatic_only_driving_license.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eff4bec0b35f4fb3da6d7e/1626338494608/kunabizoderatelot.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d5b01651423cab5f1f97/1625871792968/95470368864.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e932bd320dbd0de281aa69/1625895613252/14570977988.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_off0000ec47.bin
226c12e75ccfa7384b28c126636bd6d0eaef3d8dd9584594cb57c6a980744e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 10800 bytes
font_01_sfnt_off00010556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
font_02_sfnt_off00011d68.bin
ebb4cb65d9351b2efb31c6a469a2d55a2ac2f3d841e971da2fc7b261307115e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16640 bytes

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