Malicious PDF — malware analysis report

Static analysis result for SHA-256 21033b693e9a72a7…

MALICIOUS

PDF

82.5 KB Created: 2021-07-16 15:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02172e3c61f3e6a2948295cf0c92ba66 SHA-1: c3100a168314f3a58786c097e71e3c24cd09f07a SHA-256: 21033b693e9a72a7797748b9258bcb950ff11dedda039aa0f1f3c370505b0df6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded external URI pointing to a suspicious domain. The PDF structure itself does not contain readable content, but the presence of the external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8440

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://coretry.ru/square?utm_term=how+to+use+honing+rod
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0712b879cfb2b826ed4d8/1626370347443/28283939619.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee2ed24d490f672750cf0c/1626222290308/bible_verse_what_you_do_for_the_least_of_these.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60effbdafd683a7867c9f9aa/1626340314678/masekikomo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e848439e539748b1198362/1625835588088/latest_judgments_on_domestic_violence_act_2019.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8fac2b10b9b33fa963667/1625881283026/63699493442.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9449292abcc18c4f73733/1625900178183/email_english_2nd_edition.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_off0000e205.bin
1dd5eaea5bc4f9dd26372817e83aced4142b01e6912eac816bc3e8f06dc06017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 17020 bytes
font_01_sfnt_off00010e8e.bin
a3b8f8127eb937dc3d1ef7621bdeb3a8d2c6a54f50139a8a247871060fa3c967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10496 bytes
font_02_sfnt_off0001262f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 16792 bytes

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