Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51ce2add325b406…

MALICIOUS

PDF

95.0 KB Created: 2021-07-16 06:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6e194ed2f29fb10a25e9f884efe9670a SHA-1: 811eaff4c5ccbe940db56df9345da4bdf9b9bc12 SHA-256: e51ce2add325b406698570c0b9d75bf44412bd10140eea5a261f83ea6adc4059
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs, although currently classified as benign, suggests a potential vector for further compromise. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1532

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/~3/5JeRQhMeIYg/square?utm_term=oreo+cookie+activity+plate+tectonics+answer+key PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f09c321b697b1a33d3af2f/1626381362254/the_silver_eyes_read_online.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_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 17664 bytes
SHA-256: 5122b602587f913d6df5e417a5173b7753de1cac0534741413158dcfe993f248
font_01_sfnt_off00013f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F27 10752 bytes
SHA-256: 8278898ee230baa92c4c7e0174093d7fb7f11463a48ab112940203430c35112a
font_02_sfnt_off00015822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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