Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bf5afa9d1c41cf…

MALICIOUS

PDF

163.7 KB Created: 2021-07-20 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4151af52792f0cb2c74d913b4fd1d782 SHA-1: 474ecb3309c0302fab2c6f5f971f55b10d94e72b SHA-256: 54bf5afa9d1c41cf519d079ddb61eef1f1440b86136b27c6f8f4b5e202bb7ddb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs, though many are confirmed benign, suggests a potential vector for phishing or malware delivery. The PDF structure itself may contain exploits, leading to client execution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2787

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/NsX9ihectO0/square?utm_term=wide+range+of+issues
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3ed02b84a576e6c063208/1626598659141/14408422110.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee11818e3fff2bd3bd0981/1626214786217/kidevusosonezan.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edd23530d23a7550621365/1626198581562/90909325228.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e90be52210ba6bce115188/1625885669367/hardware_components_of_computer.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3efe1699a8678c58137cb/1626599393542/jopixumufobajusa.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f5087827519501fc25fdbe/1626671225092/soil_is_composed_of.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f06b0cf3478d215ce9f405/1626368780409/dna_and_rna.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_off0000fa83.bin
d5f5b012a5ab1d287f55fa02210dd994de63ac3d97adc4b10cc3051707826c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 119896 bytes
font_01_sfnt_off00022538.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22538 16792 bytes
font_02_sfnt_off00023d4f.bin
73c7c831d3a745caeb0d4bbbe3febc4a278e4be5e2ad004c4f726965ef918b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23D4F 10480 bytes
font_03_sfnt_off000254fc.bin
2ed3851a2a675b8a2f40b7719fd25097465441eb2f207d3e92d4269058ca3203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x254FC 16760 bytes

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