Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f047ac7ffbcd37…

MALICIOUS

PDF

91.7 KB Created: 2021-07-13 05:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 495ff2f63099185272fe70bc53c62d5d SHA-1: 2a48c9979f7bed09b12dda800923642cfaa77f76 SHA-256: b4f047ac7ffbcd379cd1adeb2ebe2cd208e82e619490e30643bd6bd8c416d9f3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a phishing attempt. An external URI was found pointing to 'https://wastran.ru/square?utm_term=shawn%27s+sewing+center', which is likely the malicious destination. While no scripts were explicitly extracted, the PDF structure and the presence of an embedded malicious URL strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.1532

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://wastran.ru/square?utm_term=shawn%27s+sewing+center PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec991a90a3fc49531b2fca/1626118426872/width_and_height.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_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 18256 bytes
SHA-256: 16be9e63dcb6b87b09d6969afdc663d6825c4d87f39347bcc54af31a43fc1726
font_01_sfnt_off00013367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 10536 bytes
SHA-256: 9623246723b4227965d08cebbbb335bf8fa1262f5b91eac9d21edc055978dbed

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