Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b90fb6387c67e…

MALICIOUS

PDF

76.6 KB Created: 2021-07-16 06:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc61d3c0e675a5535c989c262bdd10f3 SHA-1: 3a7b1077999ff72362062e1c476794e36d9b82cc SHA-256: c98b90fb6387c67e06d05a25f5b76bbf7973e3c7b5ebf8f358e580775e266ec1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect the user to a phishing site. No scripts were extracted, but the PDF structure and heuristics indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://chcial.ru/square?utm_term=saturated+liquid+meaning
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7e1385eabb22f35dae7f8/1625809209034/71338465227.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0d6bf1f3fa43bb6b4b62e/1626396351850/91551573770.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edfd70bf52576c624a77b3/1626209648520/romeo_and_juliet_act_3_vocabulary.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e933fe18245d33f1825613/1625895934588/97812706382.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c958d7d143313afeb88e/1625868632798/ancient_and_medieval_india_ebook_free_download.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec946a243eac6055d041b7/1626117226955/how_to_mirror_effect_in_photoshop.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_off0000cc37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
font_01_sfnt_off0000e44e.bin
649aef9f714b7a652afdf24a12f191f3e71904f97db7ec5a193c9286770193d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 10624 bytes
font_02_sfnt_off0000fc03.bin
b6ca6d42c08f66aa4e007bb104124bb959e8c068dfdcb8b5f8e5818f6c6916e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16500 bytes

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