Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f49fc77002b73a…

MALICIOUS

PDF

72.8 KB Created: 2021-07-17 01:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67611a106ec0e67e9aead1e24897cb50 SHA-1: 8ef4dd2873fc722cbda4d1c6f5979309e6147f3f SHA-256: e4f49fc77002b73ab21f927e8de4e69797f49806133e65eccd7555487e54ba01
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. While the document body is unreadable, the presence of embedded URLs, one of which is disguised as a search result for 'how to wash sneakers', suggests a phishing attempt. The PDF also contains embedded JavaScript, likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1797

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/CcIy6vlvkUk/square?utm_term=how+to+wash+sneakers+in+machine PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8956ff6d86145ba1c027/1626179926582/the_shrinkage_of_muscles_from_disease_is_called.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8514e348bfa1087a61e5c/1625837902920/free_fire_diamonds_and_coins.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC185 10620 bytes
SHA-256: 19b1db4d01f5f59afecf8aad30ea97c8ce65623bf71d8be1e87fc599e5f723ce
font_01_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 15048 bytes
SHA-256: cb643e2371a7e28568329458464a03dfaa0cecc5f09b3c2b71b0de16d9ac3cc3
font_02_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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