Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7165d28d77ef253…

MALICIOUS

PDF

77.7 KB Created: 2021-07-16 03:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e335acbfbc2ba3d9600121cb6b10be6f SHA-1: 8632d393f1a6a19901687cda272355a5b1b10e48 SHA-256: e7165d28d77ef253378e66857b187ca99687a23d1e76cd781cdc4e42eb924a63
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 an embedded URL that, while currently classified as benign, is presented in a context suggesting a download lure. The PDF structure itself is unusual, generated by wkhtmltopdf, and contains obfuscated content, indicating an attempt to conceal its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/jEScUJLm1bs/square?utm_term=download+3gp+movies+for+mobile+phones
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7b07f8592fe3a588f81bb/1625796735717/3.95_kg_in_pounds_and_ounces.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f03ec3bba06d2f341c1520/1626357443605/95322530815.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec87f3ad4a1a22a3e7ddca/1626114035203/st_patricks_day_appetizers.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_off0000cf65.bin
5ca2f3b1cdf61a7b362e8592d181190ca0886ce8dbadd477a257c9347e43ba2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 11312 bytes
font_01_sfnt_off0000e963.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
font_02_sfnt_off00010175.bin
31f771c97d495d665a7d59f44a78a2244e689af1ce708e6b8ecc68b43c774c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16080 bytes

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