Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca050d6ccc27b7a9…

MALICIOUS

PDF

74.8 KB Created: 2021-07-15 13:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13afc92d8fa436d1214f5ab5eefb6764 SHA-1: 67a2db3b1d05121743bd3ec608f744f6da441d81 SHA-256: ca050d6ccc27b7a9afa7cd165bb7f018cebcfea912bb1c274ab0aac2cf6e43f0
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 high likelihood of malicious intent. The presence of embedded URLs, specifically one pointing to a Google feedproxy, suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/UkUWPC8UKDU/square?utm_term=coughing+and+blacking+out
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed4fa667dd777ebfbfcffb/1626165158215/xekipitibep.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0063f5740a719f4ac6679/1626342975160/32670181441.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed26fbf9a98d6db3aa675e/1626154747919/combine_variouss_into_one.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec90215f8bf969071ed4d9/1626116129537/clinical_malpractice_meaning.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_off0000c878.bin
cd2edc379cce9024d811042d00955c5bc63ad24f3de8dc6ea3d8d3efcc57048e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 10612 bytes
font_01_sfnt_off0000e072.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16792 bytes
font_02_sfnt_off0000f884.bin
ecd38dc23623444ea5df52a45ddf3afea25de46929d677da15d2b1df0c0f1083		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 15352 bytes

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