Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab250cc11da83238…

MALICIOUS

PDF

78.3 KB Created: 2021-07-16 01:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3028d81d41cc70be721c0dc5228ee489 SHA-1: cbce2b962a918c3f5a5be4fa3a8a67b134bd25af SHA-256: ab250cc11da83238f1572f74d19a5fde465850df47db2c9e9f19122abf878b8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded URL, although labeled as confirmed benign in this context, suggests an attempt to redirect the user. The PDF structure and metadata indicate it was generated by wkhtmltopdf, a tool sometimes used to package malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6665

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/~3/0YvHz_IItD0/square?utm_term=papa%27s+burgeria+download+android
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f05514cd60116a3c3737dd/1626363156842/about_corruption_in_english.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e904d412fb7d0b27923189/1625883860554/reese_witherspoon_ava_phillippe.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c65f09230f0e184245f8/1625867871454/the_battle_cats_story_of_legends.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_off0000ce39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 16792 bytes
font_01_sfnt_off0000e650.bin
7f20698b4e38c2b679a8892bf80fa70d3ee61ae099e603583d8de9c3527a5da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 10832 bytes
font_02_sfnt_off0000ff0a.bin
6fe570d604b3fb542495146423eff3a1dfe23b142197c5b90213c18203fe2756		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 17096 bytes

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