Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba663bb30b41c5a…

MALICIOUS

PDF

76.0 KB Created: 2021-07-16 17:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b12f741978eb36cc7ad7c077a73c7ef1 SHA-1: c8eda8301a5d9718f6c59be7bba09ec20033a7f2 SHA-256: bba663bb30b41c5ac38b4d8a936fddd1dddc69daf115f385037f2e658f88f70e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI that points to a Google feedproxy URL, which in turn redirects to a Squarespace page. While the specific document body content is heavily obfuscated and unreadable, the presence of the PDF_URI heuristic and the ClamAV detection strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is likely being leveraged to deliver a malicious payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7056

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/qQn0o4eTdIQ/square?utm_term=funny+pirate+songs
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1284ee9ec2a4c2bd9e282/1626417230636/73571616704.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0288cec49181e3c1312b0/1626351757208/roger_s_pressman_software_engineering_a_practitioners_approach.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7811700aa07a78939eb8/1626109969484/formula_for_a_curved_line.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7d1bbafd06e4982ea0003/1625805244005/tools_and_equipment_regularly_to_identify_defective_ones.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_off0000c814.bin
3dd88e4313d0e9f54e96654e5130567bb9955328fed388e31e21bda85f8b95c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 10572 bytes
font_01_sfnt_off0000e065.bin
780cb0742ee97feeb01e2a7c2b7496bf6572f5480720a70c4ffdc7a587ac3b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 16328 bytes
font_02_sfnt_off00010adf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 16792 bytes

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