Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad338f4425ca690…

MALICIOUS

PDF

74.0 KB Created: 2021-07-12 21:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa7e32bd2ace03c2f5403f989145a36f SHA-1: 011903b55ac8b34c78f2e436b3386a0cc7a9d0e4 SHA-256: 1ad338f4425ca690d089e3f4b53cbc55a8b4e2028cab90ac5422ea54439efac9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'synerhu.ru', which is likely a phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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=equation+of+orthocentre
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8365b46a8e17713e8873b/1625831003150/10_differences_between_data_and_information.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7afdc48fdc259403e6676/1625796572464/prolonged_sexual_abstinence.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7ce9c268f363b08616d9/1626111209992/68530853887.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8bcf03add050c1b4a817a/1625865456408/92475705657.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91cf4b68d8f0f4bf81743/1625890036734/how_to_make_game_using_html.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8d31af807f1e152614c5/1626115377948/why_does_chlorophyll_look_green_to_the_human_eye.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_off0000c06a.bin
2752190c998ba4644b63b7222fb5ad078c131bf136dfe62422b43b570aaaa9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 10448 bytes
font_01_sfnt_off0000d806.bin
c68e44a61dbeb0e0b38a8aeefc343f279bd933b8d8513389390253016e6a6a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 16876 bytes
font_02_sfnt_off0001041c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes

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