Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d41b5bb078462ea…

MALICIOUS

PDF

76.8 KB Created: 2021-07-13 17:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19476e8a4a8752215fd1f6184ddbc035 SHA-1: b9db18d92e50bfb5d365ed9406b528daa3988c13 SHA-256: 1d41b5bb078462ea8941b6adbc99d092fc6b0dad2ef9728046a2600c20cacff7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests potential phishing or payload delivery mechanisms. The file's structure and detection by multiple engines point towards a threat that exploits PDF vulnerabilities or uses social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://feedproxy.google.com/~r/razvivatel/yapz/~3/UZrB20b2Dcg/square?utm_term=pdf+to+word+concertor
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed940743ec04194fda27f7/1626182663770/warsaw_philharmonic_orchestra.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7761cb19f4840add38334/1625781788908/3_levels_of_memory.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79b3048fdc259403d3209/1625791280855/35985458894.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7b6ce94d7a30e0547b9a/1626110828402/idolatry_meaning_in_tagalog.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8df9af107ff2467e59138/1625874331062/40193808258.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eca99a45711547b6aa008a/1626122650489/reflux_and_sore_throat.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_off0000d084.bin
510614628114dc18b2dab738df73f68f40027c94d4df01f2ff094c578506e1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 10088 bytes
font_01_sfnt_off0000e72e.bin
c7789bae4acc55d0142a936c9239489b9fdec6c6f9f9b72e6f6cdf7c644ba2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 15540 bytes
font_02_sfnt_off00010f80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 16792 bytes

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