Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f9f30f132d2cec…

MALICIOUS

PDF

96.1 KB Created: 2021-07-15 17:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd88a775be7afb224130463e655c6d4e SHA-1: dc9b05be0786ceaa0d3ba14c59f7048d459b9ae1 SHA-256: f3f9f30f132d2cec61e2c22123728ca8fd3fa870ec695e0c97f44eb8a67debb4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are marked as benign, suggests a potential phishing or credential harvesting attempt. The PDF structure itself contains anomalies like duplicate object bodies, which can be used to evade detection or embed malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9444

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://feedproxy.google.com/~r/sq/ugae/~3/ZV5PD9BTPXI/square?utm_term=standard+english+means
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecc930526e29087383f516/1626130737046/cute_art_and_craft.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f94645e16b3be7eb0367/1625815366673/difference_between_traditional_file_system_and_database_management_system.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edbfd87ce58f02ed907e44/1626193880263/woseduvo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda28f1a2ce466740c51fa/1626186384139/ethics_and_management_system.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee3c4ddb6052518ec6768d/1626225741597/conclusion_by_deduction.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9285ab132fa362073bfa0/1625892954782/inter_school_meaning_in_tamil.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee6efe77e2cd4113f2dd6d/1626238718468/what_is_abnormal_psychology.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee8c1e8685745b7d191398/1626246174426/fazaposowopuvinuwex.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_off000117c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 16792 bytes
font_01_sfnt_off00012fd9.bin
ac986b08f601137c042b062aad3d3d604227919842a547596b0d8cd582995a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 17444 bytes
font_02_sfnt_off00015d60.bin
1558393e058d2f97b54e58e94cf6ca84bba7e86a79127e60ec9934f7eb6b15e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D60 10648 bytes

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