Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d825151af55b3e…

MALICIOUS

PDF

77.4 KB Created: 2021-07-14 00:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d8dcb1600fb9a3b2e9bab6b1e105f3b SHA-1: c49a10d870f99e2d903c6895025c7dcf2c0af6f4 SHA-256: b9d825151af55b3e20074411434c94f9d1058011855f936e67d1310bb242e497
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The obfuscated document body and the use of wkhtmltopdf for creation are common in malware delivery. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/IdU8rIDf9lQ/square?utm_term=what+is+a+form
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9414012fb7d0b279470a4/1625899328424/call_of_duty_beta_apk_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edff5dc6126f45c3e58b2e/1626210141113/xodefobibud.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8d61f4b4775d049fe70d/1626115425622/9056597371.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_off0000d13d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 16792 bytes
font_01_sfnt_off0000e954.bin
3c7c28fbaba21418a5b3c4905bfd09100933ba8c1326658d6962a4037337bf47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 10192 bytes
font_02_sfnt_off00010030.bin
530a80825991e47294e3d6361d5a5a7eecb1e4a8c3657d496b4dec87ccc61341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 16292 bytes

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