Malicious PDF — malware analysis report

Static analysis result for SHA-256 9578915a7d524612…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 01:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79de6ae6e962071835fe67d7b95585da SHA-1: 44d0bd040a1ba0df9c10d891c9778fa8719af4c5 SHA-256: 9578915a7d52461266c786ee20e331752053febf415d26b60c14a6593a0b1304
96 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The presence of embedded URLs, though many are marked as benign, suggests an attempt to redirect the user or download further malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/CHqDoFjlE84/square?utm_term=a+manometer+contains+two+different+fluids+of+different+densities
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edd28ae11d817478d0aaa1/1626198666403/peritonitis_in_pd_patients.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7e68fb977dd1475ca7727/1625810575787/should_you_double_space_after_a_period.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7cf019a16f038d619f6d/1626111216299/what_does_free_message_blocking_mean.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eda73ec2b60e0ed5b5c7a8/1626187582164/diagram_of_rock_cycle_with_labels.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_off0000ce9b.bin
a6f42374c8b6ca5fac66c70de4cb0da21875fd29ffe5c5be9d448285e94a932d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 15732 bytes
font_01_sfnt_off0000f6e8.bin
a8cf9d48a8affbdee6cb098d68b3a7d68e71b0d388e5554b97a76d5219a094d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10804 bytes
font_02_sfnt_off00010fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16792 bytes

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