Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38bd272648c5238…

MALICIOUS

PDF

77.4 KB Created: 2021-07-19 00:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10cfd415913c735dfe2b2f3289d87e9b SHA-1: 2e1a280f9cd167c87e64aa59ef7942e31e0e7ccf SHA-256: a38bd272648c52386d33084ea7713184bc427b4f0592ae4264224c1e8dca31ed
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, even if some are marked benign, suggests an attempt to direct the user to external resources. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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/EjZ5HCEZs_A/square?utm_term=citing+black%27s+law+dictionary
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec93b183836e7a7d62235e/1626117041347/can_you_eat_corned_beef_without_cooking.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edd676a0f2ca3483d124b2/1626199670966/the_genetic_code_is_a.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0199a36870d1a2db8608a/1626347930922/17125905118.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e82afe25441e1b37892c3d/1625828094852/67077861020.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f11d045d599800102e61d9/1626414340621/should_my_cat_sleep_in_my_bed.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_off0000c9de.bin
52b292f52d5bca43a92222ebef26ad704d04a4adfbd710e5b0b63a53912daeee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 17392 bytes
font_01_sfnt_off0000f6d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 16792 bytes
font_02_sfnt_off00010ee9.bin
49511ddc3dc909feef1bd987e02d5dad0850ac12d69e6852c67be8516069087b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 10908 bytes

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