Malicious PDF — malware analysis report

Static analysis result for SHA-256 163c77d0b814406d…

MALICIOUS

PDF

77.3 KB Created: 2021-07-16 13:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96d6167a38cb623391be713f47213127 SHA-1: e01a00b967640611917580053779e42f5ea8e4ca SHA-256: 163c77d0b814406d52babff560d74943eee32c817c42882ec216cd279255399e
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. The PDF_URI heuristic indicates an external URI was embedded, suggesting a lure to external content. While the document body is heavily obfuscated and unreadable, the overall detection points to a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/ZV5PD9BTPXI/square?utm_term=hair+smoothening+and+highlights
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec91e13080d76c7a51dcb5/1626116578029/reading_and_writing_sat_practice.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9421df492d21a0f6be102/1625899549750/end_of_term_report_for_preschoolers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed9b0beb7cc826ddc59398/1626184459420/44102319036.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7c9f91873c46ac938b14c/1625803257544/kilonevibazekedujilivuram.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f090f31d9bd956bd16c4cb/1626378483573/88066243019.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_off0000cb7c.bin
07d5ed1b72c8850ffc45b869133e5e1ebf19a0037ac8bd4a91a900bdc497cfd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 10688 bytes
font_01_sfnt_off0000e386.bin
a827f8bff357f34acbaaaef69c38979176bf65e413c801dbf72e90a9356a9ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 16928 bytes
font_02_sfnt_off00010fa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes

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