Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcfb088ad483d50…

MALICIOUS

PDF

78.5 KB Created: 2021-07-15 10:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85106d47382a59a99c97ea6fbe9e8f93 SHA-1: 74b6d5b56212b6eb785336203da457de5b839456 SHA-256: 7dcfb088ad483d5067fc204a7497460dc2990899fd4d1b9892df6a6a52e36386
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which is a Google feedproxy URL that could be used to obscure the true destination. The file's structure and detection names suggest it is designed to trick users into downloading or executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8740

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=reporting+therapist+malpractice
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92a9ae370ac63228940fd/1625893530297/3579753678.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7721d3e792b6fba2ed8b1/1625780765335/ributovimizugajax.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e89948ddeed5612f661b50/1625856328466/samsung_note_user_manual.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edfb67d6548a387fd62cbf/1626209127541/32630832366.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec81e84027437375965650/1626112488282/xegize.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee1db2df3d323292ce3917/1626217907070/healing_for_the_soul_scriptures.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_off0000d1fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16792 bytes
font_01_sfnt_off0000ea0f.bin
6457c5438beae10441f5a4ec5292d5fbfcb3856fa827ce5ce9c64a901fbec54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16624 bytes
font_02_sfnt_off00011537.bin
95dbcde4987b8909c91b22669de204b1f6874b4867132942df6e7d6f2e883237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10864 bytes

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