Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8d66545b3957fc…

MALICIOUS

PDF

78.9 KB Created: 2021-07-12 21:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8cb66dc5bf8563d80ab6db5f2c269fe SHA-1: aa9ce624b6fffd4ae761ae816039c1875fb1d5e9 SHA-256: 7f8d66545b3957fc094b5df1f32f2f987450f8b50c1caf1e1ab7531306109fc1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The presence of embedded URLs suggests the PDF is intended to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5948

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/um1bUVUAM38/square?utm_term=latter+meaning+in+english
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec820f67baa26076bb9a5b/1626112527831/paul_hollywood_and_candice.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e942f7f107ff2467ea0eca/1625899767833/hospital_space_planning_guide.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e91d99b9b95949b65e9bcf/1625890201588/2nd_puc_physics_question_paper_2017_march_with_answers.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7b634c0b954f9ea36766/1626110819927/41528919459.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7b751bab06216133682ea/1625798481260/god_is_not_one_stephen_prothero.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48b.bin
0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC48B 2296 bytes
font_01_sfnt_off0000ce86.bin
864559b90d975e26c8139270d44db4893f2a98fdf9054dea15c7d611dd851ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 18880 bytes
font_02_sfnt_off0000fe7a.bin
0513f523ec89033332a8e2b0fef24e2bab061492744955f7ba4efe4075a165dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10392 bytes
font_03_sfnt_off000115c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes

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