Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa031db873a2efe3…

MALICIOUS

PDF

77.8 KB Created: 2021-07-12 21:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 93a83436d9b0c5f38ceb8aec858307e1 SHA-1: 21d6486bc6d34cd4acba0faa7bd75461807cc8d1 SHA-256: fa031db873a2efe3c5c4aac8a80c6eb867e858c3add712c57c7c767d40c7f35f
66 Risk Score

Malware Insights

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

The ClamAV heuristic 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicates a phishing or trojan payload within this PDF. The presence of embedded URLs, although marked as benign, suggests an attempt to lure the user to malicious content or download further stages. The PDF structure itself appears to be exploited, as indicated by the 'PDF_DUPLICATE_OBJ_BODY_INCREMENTAL' heuristic.

Machine Learning

  • Nyx PDF Classifier clean score 0.1551

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/nCRFBnYrBHY/square?utm_term=city+lights+song PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8cf10c81c3e1fd729bd44/1625870096722/the_story_the_teacher_told_us_was_very_interesting.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 10140 bytes
SHA-256: 34b55d17f525a8a0a63a355e8244c8b73ac42a22f8c96e23ad2d7e63fdb88e55
font_02_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 17352 bytes
SHA-256: 04f656e31ffc2eca8c0d833ce9cbfd4752cf7cd4f7c36ced139f41c0566c5b25

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