Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8337910b0e68ab…

MALICIOUS

PDF

79.7 KB Created: 2021-07-18 18:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a26c912c30d8d3931d69a36c3646db4 SHA-1: 3da378893e1126da8ed05a76f03f1805ba4c3e50 SHA-256: ce8337910b0e68ab0dc7e97c42714372f242b9ffbe7ae729277fcc344bf1b000
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that leads to a URL which, while currently marked as benign, is part of a pattern to lure users to external sites. The document body is heavily obfuscated and truncated, preventing a clear understanding of its specific content, but the presence of the embedded URI and the malware detection strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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/qI_NY8u86tA/square?utm_term=death+note+ep+1+eng+dub
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f046ccb37dc55b03543fed/1626359500217/can_dogs_eat_food_with_vinegar.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eddee2e55429721e21069c/1626201826723/25419486881.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee904602e0767984f7f03c/1626247238559/99934000268.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_off0000db89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16792 bytes
font_01_sfnt_off0000f3a0.bin
44b97098b10e9baa1a3ff95126b3169907dfe5e5e61ff120bc01d424f9ce2e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 10556 bytes
font_02_sfnt_off00010b32.bin
1e35df02ca3cc7b47ad11aa22f5fbb1901cbe9db2ac089b70caddf4350825324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 15624 bytes

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