Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2f4100eb2eaeef…

MALICIOUS

PDF

75.1 KB Created: 2021-07-13 18:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 283e2158194baa1712c43ef376a55290 SHA-1: 78208ee905d3fa0e6ce9eb5d5611effb38f72cb0 SHA-256: 9f2f4100eb2eaeef2df7189646c401e0fd26cc4b6259347227c56649910cea40
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, even those initially flagged as benign, suggests an attempt to redirect users to malicious content. The PDF structure itself appears to be malformed, with duplicate object bodies, which is a common tactic in obfuscating malicious content within documents.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/5Aj-mlxkUx8/square?utm_term=herpes+zoster+in+pregnancy+treatment
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9fa90f7d8d50062e6937/1626120105533/the_power_of_positive_thinking_in_marathi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8fa9bf229ba2ea8358530/1625881243185/the_framing_of_the_us_constitution_word_search_answers.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_off0000c236.bin
359662b331134749c931e999b6f1f83f2453bb3521ced4fc33b649c3b7725ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC236 16708 bytes
font_01_sfnt_off0000edca.bin
f2373e28a7fdbdbc35f9f6bdf3e80863b59bdb9603dd86922bbcc8a2a57b1cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10836 bytes
font_02_sfnt_off000106d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16792 bytes

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