Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a51a54690a6e14…

MALICIOUS

PDF

75.3 KB Created: 2021-07-16 06:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e762f58b8d6b829295ae0a14c3ab4b SHA-1: 9ee4edf26be92bd4a705087cfa0d17e573d6371e SHA-256: c4a51a54690a6e149a115ec19420aefddfd3d017edd83cb5540441bddc9a8ba7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'synerhu.ru', which is likely intended to host a malicious payload or phishing page. No scripts were extracted, but the presence of the external URI suggests an attempt to redirect the user to a harmful site.

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://synerhu.ru/square?utm_term=constant+fluttering+in+chest
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed3be92ae47d2ac920751b/1626160105584/country_line_dance_sheets.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f06bfc879cfb2b826e5c96/1626369020515/4107618868.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edeb346f118478735d78e2/1626204980465/how_to_make_butter_out_of_heavy_cream.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_off0000c770.bin
5a1271c2047f1d936181168cdf4dff93f47e8263015aa53c74e7758091a4d2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 10744 bytes
font_01_sfnt_off0000e023.bin
cb5c254751f07dbc314149ad0ebd4c80258fd5df7b499e9213c16f4808df198c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 16112 bytes
font_02_sfnt_off0001099a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.