Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4ca6e5e497ef87…

MALICIOUS

PDF

80.2 KB Created: 2021-07-13 18:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2d32fdc2394868d2852d02ebe403595 SHA-1: 6c7a7cc3754455158497d6629593033276f74473 SHA-256: df4ca6e5e497ef8708e3ca76502db0b9e9e9b98781cff48ce2f4de7c459bfabe
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or trojan delivery mechanism. The PDF_URI heuristic indicates an external URI was referenced, which could be used to download a secondary payload. No scripts were extracted from this sample, but the overall structure and heuristics point towards exploitation of a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/k6oGaauGqGM/square?utm_term=black+yellow+green+white+blue+red+flag
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e77eae61166b169c483e5d/1625783983239/jedojenasenowuvotakose.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e77cf76e66ad59e27d2441/1625783544067/display_in_asp_net_page.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec733872e2584f24618618/1626108728473/hack_using_ip_address_command_prompt.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9aa04f2b1c51afa5e05e/1626118816853/iphone_11_pro_hdr.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e84dac30ecfa0852d549ee/1625836972201/laresin.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_off0000d6b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16792 bytes
font_01_sfnt_off0000eec2.bin
755538027bfecc4ac710d058bd69f9459d9fde0aa06be9d6a5c854a9ba40ff8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 17320 bytes
font_02_sfnt_off00011ac9.bin
b85421c09769c6d26ddfc1a6c857b4d8e05c4e4a25f374e36077155f1eadd168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 11172 bytes

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