Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f516f2fda7129b…

MALICIOUS

PDF

78.9 KB Created: 2021-07-15 11:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96c03232b12aaa66eb35a8a9465fe661 SHA-1: 59d4b246fd5264c8e3be4791ab5d2d0f2c8bd520 SHA-256: 87f516f2fda7129b144c0857eef758f16df7dea30027df59b0af4028878d8d76
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. It contains an embedded URI pointing to 'https://medvor.ru/square?utm_term=irs+form+1045+schedule+a', which is likely used for phishing or to download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL and the overall detection strongly suggest a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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://medvor.ru/square?utm_term=irs+form+1045+schedule+a
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edae69c0b9b61b597667a6/1626189417730/microelectronic_circuits_by_sedra_smith_6th_edition_solution_manual.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed23c6e255175820bdc7ca/1626153926988/minecraft_how_to_find_treasure_chests_easily.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd724d6ef6771c1db21b0/1626199844473/aggravated_in_malay.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edf734e83f616bcf85989b/1626208053025/motor_innervation_of_the_hand.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edcce6cc8e436e4663bb63/1626197222328/50699552952.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_off0000d4c6.bin
ab1a2a5ef1f144d868fd4662aa0410dc0293dd495cf80781d562f78cc568e629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 16144 bytes
font_01_sfnt_off0000fea1.bin
050938f5debbaa91e5bc862d8520556182bf721fd52298b711f3f8930b48447e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 10884 bytes
font_02_sfnt_off000117f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 16792 bytes

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