Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84494d56f759931…

MALICIOUS

PDF

74.9 KB Created: 2021-07-12 20:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c824c49952b4421f5b2bc5252c16bc32 SHA-1: 35ae0a1dce040cedee3e8c5c0e9b396c4210bfe9 SHA-256: e84494d56f7599311bf1a1e2606c483f3720e12eab8c2476c052acbdbd031af8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. An external URI pointing to 'smidgel.ru' was extracted, suggesting a phishing or malware distribution attempt. The 'wkhtmltopdf' authoring application and the presence of embedded fonts are common in PDF-based malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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://smidgel.ru/square?utm_term=letter+d+handwriting+practice
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e835ae7e45264421fc56a3/1625830830934/best_wishes_on_your_next_endeavor.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec79957726b430b46722c3/1626110357597/bed_bugs_during_the_day.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e87c14c1b8c730acebd103/1625848852142/15754852631.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_off0000c2b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 16792 bytes
font_01_sfnt_off0000dacb.bin
aa3ed52fea66fc8f6c9d8d3631c71c90d26ffc02e3936624c66638c38bddf27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 10500 bytes
font_02_sfnt_off0000f26b.bin
4d24d9b6334cc447e4549d0b7a1816b7c2bb382ce075750a4d2a5bc55746723f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 17532 bytes

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