Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e99589e3ec09c6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-13 16:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58bf94673592631dab1283381997ebe8 SHA-1: 747310a7dffdb0924d11ad06ce4e86920728a142 SHA-256: 01e99589e3ec09c69e9b52ed4a435cae7510426d07fb7ecb665520e24677d8c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains an embedded URL that, while flagged as benign in this instance, is indicative of a potential phishing or malware distribution attempt. The PDF structure and heuristics suggest an attempt to disguise malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/um1bUVUAM38/square?utm_term=empire+of+the+censors
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8cc144349d7bb06cef44/1626115265528/arithmetic_sequence_model_questions.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed3cd5a17c7f1bf0018198/1626160341143/how_to_grow_green_onions_indoors_in_soil.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e89e0196754c2235d52f3e/1625857537501/23707325327.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94047e6bd1231e608f176/1625899079913/98360274589.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_off0000f08c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 16792 bytes
font_01_sfnt_off000108a3.bin
dcd5f912bc18a58bb7af57d66b364892c84ee4369e4d904f202a584202c8be9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 10520 bytes
font_02_sfnt_off00012056.bin
34598494e8b0ffe3bc93ac61c87fec7ddf7e8d27f3d964784f1c81c4fb4777ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 15748 bytes

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