Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21f92cd9fe89eb3…

MALICIOUS

PDF

75.3 KB Created: 2021-07-13 16:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48149dbf8c798ed206dcb378db678e0b SHA-1: f89956a53ccb6d68bd61aeb20b56f17aa64c1ba6 SHA-256: b21f92cd9fe89eb316c8221d4e154591e3decc6243b27e8b929122ec4343990d
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further stages of an attack. The PDF structure itself appears to be exploited for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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/mHcMeCcfVl0/square?utm_term=copy+pdf+file+to+excel
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecaa639cb57f380a7b5da1/1626122851325/it_is_also_called_the_cardiovascular_system.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec839de94d7a30e0553f6d/1626112925663/nojanu.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca88fe4ca3800a11b4e40/1626122383363/i_had_enough_meaning.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e848283fca625151cb1203/1625835560955/vagadisuzi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed920cbc9b4721000f2a9f/1626182156311/9997017596.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_off0000c6dd.bin
13389b1e815f90d0c8fcd0082df9f3e4be265cb3dd6638bd47aea3aad0d52e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 10328 bytes
font_01_sfnt_off0000de48.bin
cb0261c17defc6dada175ee72c2151d3b7849da9095341282fe54b420b403ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 16540 bytes
font_02_sfnt_off00010982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 16792 bytes

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