Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9d2df9c6a24640…

MALICIOUS

PDF

80.0 KB Created: 2021-07-13 08:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b39b09da24cf3b7b3bfb93aa289d229f SHA-1: e0a6775077a0f392b4c064e7b65e4eab25de7ee7 SHA-256: bb9d2df9c6a24640dc6f212054ad9b56da65e303890d996554b9db9678a959f3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to a URL that, while currently flagged as benign, is suspicious in the context of a trojan. The PDF structure also shows duplicate object bodies, which can be used for obfuscation. No scripts were extracted, but the presence of embedded URLs and the ClamAV detection strongly suggest a phishing or malware delivery attempt.

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/sq/ugae/~3/AnJPYMJXbyQ/square?utm_term=hiccups+for+over+an+hour PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecadaf58d864752e0534f1/1626123695721/dee_wallace_critters.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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16980 bytes
SHA-256: 12c9b0c3960c5c4d606bca0926343cc9d2869b9a251e60cd2d431250dbaa1be9
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 10592 bytes
SHA-256: 8c9f895fb5c7d3617ce96788b155c170ec70e196c02fece22da2c3cb7305c52e

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