Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cb9a1a6a81588f…

MALICIOUS

PDF

76.3 KB Created: 2021-07-21 01:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3deb310bab4392c507716ed5b92627d SHA-1: 5e9b7f597f7a27d4de7afacf222e0ef19ab04a4a SHA-256: 83cb9a1a6a81588f8e277a0dbad5c9955c9b2ad8ed9a338f73af6cad20af778a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs, though marked as benign, suggests an attempt to redirect the user. The document body is heavily obfuscated and unreadable, indicating a likely attempt to conceal malicious content or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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=polygenic+traits+are
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0c303db86a67d857caf7a/1626391299617/29038429589.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f5739b25edf12306731c5d/1626698651489/is_the_number_0_positive_or_negative.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8bd8ff28789513b6343c1/1625865615443/28844888619.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f22ccc7c08645924d6fc/1625879084166/flapjack_with_treacle.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f429126167905317e27d7c/1626614034135/79415191281.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_off0000cf68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
font_01_sfnt_off0000e77f.bin
d2129c4d7111e5f4e1b1b057037e119a5abdbdfb16e5bb40d3833214b7de6ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10520 bytes
font_02_sfnt_off0000ffa3.bin
c6b8510bfe041d8702b7514f7a4cdf3f39d595578123270572b220fe8488414f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 14988 bytes

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