Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a6882246bf3619…

MALICIOUS

PDF

80.8 KB Created: 2021-07-14 04:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b2fa18d5ed7e6b6572308e2c43fb36f SHA-1: 2522a03eaf7b7b70c03a4ba2c796481cbe4acb85 SHA-256: b4a6882246bf36195de365782128251207eb9c7bd2ba75d4727da5c037e656c6
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or malware distribution vector. The file's structure and heuristic firings align with known malicious PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/v-xubMviL4Y/square?utm_term=be+kind+and+polite
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7ada3f7a034ccb799743/1626110682566/24352483841.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edd4b1e6792c2552b9b6fa/1626199218103/lusex.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee1ed7114e6b7b7de49996/1626218199387/sujerul.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec98b405183b3b579f390d/1626118324127/57065438864.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edba1771211a7214c2b178/1626192407649/dibufibexaxinol.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee209eeed6cd77ab600031/1626218654546/jawitanutekakaposid.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8f6f337da2614570c42db/1625880307878/the_magician_upside_down.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec9119651b7076defba948/1626116378026/wikiledefabutedopelubona.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e90059e6a58043b6902b1b/1625882713952/31925184349.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e943e12210ba6bce1337b5/1625900001623/green_power_sources.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_off0000dcd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
font_01_sfnt_off0000f4ee.bin
3403be165538ad5d91247ee734b50f70199c716f2ca84afad548cbfec2441a48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10260 bytes
font_02_sfnt_off00010c17.bin
81dcbf369b32c91e615f23f481cd453e946daef5c5e94bac94edc38d96512644
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 16824 bytes