Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07329aa528a7978…

MALICIOUS

PDF

75.5 KB Created: 2021-07-16 08:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46375485bcbd2f47658bdcb40bffb1db SHA-1: d0f7e0daa1300cede054074d98fdf5daaae9ed4a SHA-256: a07329aa528a79787cf64c13c1ff7feddaa0b4539559cb1e7f1168daa458ff8b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The embedded URL, https://pistant.ru/square?utm_term=irs+get+my+payment+second+stimulus, is likely part of the phishing lure, impersonating a government stimulus payment notification. No scripts were extracted, but the PDF structure and URL strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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://pistant.ru/square?utm_term=irs+get+my+payment+second+stimulus
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede89b3e01114371296254/1626204315869/72187131453.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e77ae12dff2e38461d3239/1625783009328/93771367188.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efe08bfdf156014349303f/1626333323520/demorazemutiwezawujomo.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_off0000c390.bin
0955371aa7d1711cf52a88edd024e51b4b45077c85c7a6397033ae6dfa869e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 17296 bytes
font_01_sfnt_off0000f0c4.bin
1b03fde20e6d7046c15f1c5356e876ef39108d1f98b7621cf7d311bc25dd13db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 11020 bytes
font_02_sfnt_off00010a30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes

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