Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740521f245b1489…

MALICIOUS

PDF

78.0 KB Created: 2021-07-17 02:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a64f1c5b6762c8ffd7f42b85bffdbd27 SHA-1: b0a9363a99149cb14bf8f11822f975e1ed965d06 SHA-256: c740521f245b1489a2e042d4dc7cf5e0ceceab406310d1f938c6f58156d51e41
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 both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those confirmed benign, suggests an attempt to lure users to external resources. The file's structure also shows duplicate object bodies, a common characteristic in obfuscated malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/sq/ugae/~3/jEScUJLm1bs/square?utm_term=best+airlines+to+fly+with+esa
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8bf90cf33f708d7b4ac0/1626115065366/fererogizowodekojexego.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edf86a36d5170423630578/1626208362562/legend_of_the_fist_2.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e81b5228bb5f4f5165fc8d/1625824082379/class_10_maths_chapter_13_exercise_13.2_question_4.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_off0000d1d2.bin
990a3f08de849e51bce57cd768a97be59c8858fc22269b2cf0914076edada4fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 16364 bytes
font_01_sfnt_off0000fc2d.bin
33a6b67dfda08f98de870dd7d5d51aee9148496076b2c7b38d9ff7d002830d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 10564 bytes
font_02_sfnt_off00011451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 16792 bytes

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