Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe8e4c9d7909fc1…

MALICIOUS

PDF

88.4 KB Created: 2021-07-22 00:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 951fe1c446a7a4721104207735da265c SHA-1: 9547f950afbd4bd8573b4fd868c517d404222eae SHA-256: 3fe8e4c9d7909fc16c8840f26dad2c9a4866ae49b20058cc25e38eed36444c87
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'synerhu.ru' was extracted, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of an embedded URL is a strong indicator of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=character+vs+fate
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f6ce65632cc27cc56602ca/1626787430388/the_right_of_suffrage.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5b037f14df314cec8a936/1626714167412/12865575705.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f7857e896e5a6c1e30b519/1626834303038/conjugation_for_avoir_in_french.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee86b3e7148d06bc74d6b5/1626244787733/4863392965.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8df045fa2eb14b908281f/1625874180438/91387881313.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7ba815c13cc4fede932db/1625799297164/english_for_banking_and_finance_2.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8235b8cbe518df57a0da/1626112566022/77023041581.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f001e95740a719f4ac2cce/1626341865472/27851318782.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f10dc7e013e242e71319d1/1626410439176/average_utilities_cost_vancouver.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f41c076167905317e20711/1626610695986/watadonafedaviboxu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e88923cdde05541e21389e/1625852195844/wetilovonano.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94b16566ded7d61adee73/1625901847109/nedusazuravepamel.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2c2742be78d5265948256/1626522228689/81581491875.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f645126f73c363a851a83b/1626752274771/discrete_mathematics_problems_and_solutions.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0e2372c92ee1dddda564f/1626399288131/conrad_sewell_remind_me.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1c849a7f86910c75aced7/1626458185414/nowotitik.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_off0000f9fd.bin
59df38478ba4e48123a6e7b2bc3e7235e20519a388705bce1aa056cf37807801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 10168 bytes
font_01_sfnt_off000110fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 16792 bytes
font_02_sfnt_off0001290c.bin
7bd4a4ba1eef5b80f935397d360b795dde89fcefefec8ad51dad66de83033889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 16848 bytes

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