Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eeb8377e9fc4ebc…

MALICIOUS

PDF

76.7 KB Created: 2021-07-14 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84308dcf76536caf43c37a23e27d45d0 SHA-1: cc220b94a61ceb646d040ec7d1305b0dc1ffb944 SHA-256: 8eeb8377e9fc4ebce4f5d3eceab20c30a975c7e243d2d7a41cdc1629c6daebc7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL pointing to 'nomylo.ru', which is likely used to redirect users to a malicious site. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://nomylo.ru/square?utm_term=death+of+superman+and+reign+of+the+supermen
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edd043e55429721e1f6d93/1626198084387/renipenilemugezokukuso.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee516f4d490f6727535925/1626231151286/46549437015.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee6b1d86aa876280bf63b9/1626237725149/ghd_sports_download_free.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95ea566be7e490f117ee5/1625906853718/best_site_to_download_320kbps_songs.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90756e6bd1231e606ec25/1625884502809/madison_federalist_paper_10.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_off0000c4e1.bin
5cf910e2f4e2f9bf0eda94a11800d21051fb3dea786099f43c3ad18c27dcb71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 11000 bytes
font_01_sfnt_off0000de0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 16792 bytes
font_02_sfnt_off0000f620.bin
2e01ab7d41e923fc8c4ee00d4abb00d87ec189e9126586f0f1525e873e04da3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 18596 bytes

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