Malicious PDF — malware analysis report

Static analysis result for SHA-256 99618cf72bc4a817…

MALICIOUS

PDF

74.7 KB Created: 2021-07-20 04:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d34369264fe1b90162befe1fc5fc853d SHA-1: ffaab1f158a787b8f1bcc2284b2baae6fc1c2cec SHA-256: 99618cf72bc4a817f62cff36be9c7fc1ea966f2097d8012fdbf77b5c933cac84
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a URL that, while currently marked as benign, is suspicious in context. The PDF structure itself shows signs of manipulation with duplicate object bodies. The primary attack vector appears to be directing the user to an external resource, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=johnson+ranch+hoa+phone+number
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e78c724454ab0ddd8155ca/1625787507076/scriptures_on_influence.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f4773a26e2e727c26d7a49/1626634042486/chicago_referencing_style_footnotes.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec99197a6a1626764a86df/1626118425779/how_to_generate_file_in_php.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_off0000c5e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 16792 bytes
font_01_sfnt_off0000ddf6.bin
a390dad4278cc26b8ff738cf99412d505c120012f86373719f6d219f87633392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16100 bytes
font_02_sfnt_off0001072d.bin
312f78c424ed47683fac5637c8b1f94f0ab7ab2cc158b9de5b384018bd33a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 10632 bytes

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