Malicious PDF — malware analysis report

Static analysis result for SHA-256 f785546e24cf6a66…

MALICIOUS

PDF

93.9 KB Created: 2021-07-15 09:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe7bf5f11df64203f092a733b97cb018 SHA-1: 97c8d703ae7c025883d715cb00c8bc958ad9f4ad SHA-256: f785546e24cf6a6601d75529951a18d29f8c4fae3c93e1d29285a7ce1a6b8f13
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even if some are marked as benign, suggests an attempt to redirect the user or download further payloads. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8172

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/RVI1sXQGPkU/square?utm_term=a+capacitor+of+unknown+capacitance+is+connected+across+a+battery
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e0ecc91b61347ea03b9d/1625874669057/92524191552.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd1ab0511021e70b37c5c/1626329515159/razovoxuretowisadebud.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93b888ce0e10532d37952/1625897864775/shades_of_umber.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efcfef39c5d52effb48c9e/1626329071832/free_personal_prophecy.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8609544497c3ffe66dfd9/1625841813572/jozakatefugikalepuso.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_off00010c1a.bin
b52d9915143413c849abe4047eeb9a3b2b89c8ae713d2f5457bfd34c14c8542a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 11080 bytes
font_01_sfnt_off00012606.bin
add9fdb11280ede91ea61a974806ce14e0937eb8a1380d030d4071500288d8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12606 17232 bytes
font_02_sfnt_off0001534c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1534C 16792 bytes

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