Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c2bb67ac71b7aa…

MALICIOUS

PDF

78.6 KB Created: 2021-07-14 08:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4af2e847e2e0704a570c99f18676e42b SHA-1: c39a4a9f7c776912dfff6d6d6223673e7735cd35 SHA-256: f8c2bb67ac71b7aa5bf0928dbeb00cc3fd2dbad90ffc4bd997f242359d496daa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, although some are marked as benign, suggests an attempt to redirect the user to potentially harmful content. The document's structure and metadata indicate it was generated by wkhtmltopdf, a tool sometimes used to create phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8678

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/~3/4Ji06Fp1PxY/square?utm_term=postgres+create+table+with+foreign+key
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee1bbc115d504d3a83abcc/1626217404875/tenant_non_renewal_of_lease_template.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eddaaa2e8a4a2aca797140/1626200746840/7502716412.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93603c14ff043cd5d97dc/1625896451523/molojijix.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c07e4be6b65fb4b0bacd/1625866366418/linear_equations_questions.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94b0892abcc18c4f76309/1625901832558/great_companies_to_work_for.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee43142a4cda17625e671f/1626227476437/gta_vice_city_audio_files_highly_compressed_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eda1b0c8cbd011b90c37bb/1626186160709/rozusilamararimawa.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_off0000d01a.bin
51c45161a88f5f9aecc6b3b489dea0cd527651cc9e74282866cb1f64937270d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 11048 bytes
font_01_sfnt_off0000e9e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 16792 bytes
font_02_sfnt_off000101fb.bin
7044a0935584e286d77b0760b70ab6c30ddbce63f9db0c0654f135e7c734e2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 16360 bytes

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