Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9c746ec508c37d…

MALICIOUS

PDF

77.2 KB Created: 2021-07-19 00:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4539725bf90dce5a324a2a9a36c83bf7 SHA-1: 1717f9af0cea8ce02c1a532e15fc199d190d0d71 SHA-256: ab9c746ec508c37dbccd21d2f1c1c40044ff1e488be385beea0e808cc2f7cfbb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains embedded URLs that lead to external websites, some of which are marked as benign but the overall context suggests a phishing attempt. The PDF structure also shows signs of manipulation with duplicate object bodies, indicating a potentially crafted malicious document.

Machine Learning

  • Nyx PDF Classifier clean score 0.1538

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/iYdez4bKglI/square?utm_term=how+to+convert+pdf+to+word+file+on+mac
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0d49efcdff1298e510561/1626395806146/muscle_spasms_in_face_on_right_side.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_off0000cd29.bin
df50e0cf411f9251a423014dad7e743233f45e04729957e6e741ed9918346ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 16580 bytes
font_01_sfnt_off0000f84f.bin
ffa92338e77e1057bb8672e070becda9834a5e6213e6dcc5016899eea7452b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10756 bytes
font_02_sfnt_off00011104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes

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