Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabd400112aa41f7…

MALICIOUS

PDF

81.5 KB Created: 2021-07-20 05:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86ff25c8d5c1143c2e3c893a7fbf3903 SHA-1: 4658859c86477fd1f24d1859fae81ca4617a6f06 SHA-256: dabd400112aa41f7085350980bd535d077bc1b28315a5990cd3b206636ccc813
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URL that, despite being labeled as confirmed benign in the provided data, is flagged by heuristics as an external URI. This suggests the PDF may be part of a phishing campaign or used to distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8584

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/rCno-htTzZk/square?utm_term=letter+of+intent+for+scholarship+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f059f57affba70db7ddce9/1626364405448/chocolate_countable_or_uncountable.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9228ec14ff043cd5cfe96/1625891470266/wevodujikidawisu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec88d6ad1bf7105ccc585f/1626114262332/faceapp_pro_apk_full_version_free_download.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3f70ba9adb72803ad0980/1626601227884/best_movies_to_play_drinking_games_to.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee0f36b82b3047685cc99c/1626214198806/9830742827.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f02777ec49181e3c130c8b/1626351479297/bikudu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f5ff6d9afe3731940b36fa/1626734446164/57969398044.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_off0000dbaa.bin
03a3e28edffea246825925ca1750064bdd668305faa3ccc9098df861303f73a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10672 bytes
font_01_sfnt_off0000f406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
font_02_sfnt_off00010c18.bin
78154be7857a3a73821fee96485ef77f0939d55bfe42c5565c28ab3a67b10ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 16940 bytes

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