Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae09cb9cc06974a7…

MALICIOUS

PDF

74.0 KB Created: 2021-07-12 21:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e53be0f3c0e6b392a6b2420f06e3400 SHA-1: daa793b55ea5bcfe4d2b8ea4bcf9b5caf95cab9f SHA-256: ae09cb9cc06974a77a64f0260ffac1755927e33978a560663beb057effbc0047
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The embedded URLs, though mostly benign, suggest an attempt to redirect users. The PDF structure and metadata indicate it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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/~3/4Ji06Fp1PxY/square?utm_term=convert+into+pdf+from+word
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c274e5d4731e3e95866c/1625866868981/fumijivubexupuzimuwokuf.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7e01b1c6ee137fa10ee09/1625808923989/lurajituduvurariv.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e819b8d93aeb546a170e66/1625823672469/bezofetiditotojukelet.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_off0000c20c.bin
9644f42119de0adba02bc4ac867b787706b0cdf08b480eb67bf133aa60eff5a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC20C 10464 bytes
font_01_sfnt_off0000d9d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
font_02_sfnt_off0000f1e9.bin
660037f110fe58ddb27f2d0ae5992ecc9d6d430878397037a4ba77d92ad67328		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16424 bytes

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