Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38998cbaca174a1…

MALICIOUS

PDF

79.2 KB Created: 2021-07-13 23:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c5daeb69e31945ade29f012e476d9d1 SHA-1: 51ff87853bc5ca199d0da662f1b6c69a28769b03 SHA-256: d38998cbaca174a15abc0ff3b4b0e815c0003b150da8227d9b988a7663b31ef9
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or malware distribution vector. The PDF structure itself shows signs of manipulation, with duplicate object bodies, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8134

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/ZFaGRQ6RLlg/square?utm_term=recommendation+memo+report+example
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e446ad76c09748fa8c5/1626111556675/nightmare_withered_toy_chica.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7b0312c1416d2f19e76b/1626110723460/red_yellow_black_star_flag.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed9f279117a44628c0ac58/1626185511532/what_if_blessings_come_through_raindrops.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92e93080d76c7a51fedf/1626116841602/ba_of_science.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede2df80caa629c1dc9fd7/1626202847491/32894897971.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_off0000d6b4.bin
af65439520e17fbdf176cc42ffd4e170b8b7ffd4eee4b49aab9a00106ef8d8bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 10656 bytes
font_01_sfnt_off0000ef10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16792 bytes
font_02_sfnt_off00010722.bin
266c696d03d6b77380c5a4de1ef41a9bea9babe3f1b2319540df72aacbfd22d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 15660 bytes

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