Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a16ff96245c8fb…

MALICIOUS

PDF

83.0 KB Created: 2021-07-16 21:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95ac5a33dfaf55b32be0db1bf174b72b SHA-1: b7ecea90d0a638903095f0774d512791f5b20dfb SHA-256: 85a16ff96245c8fb7614ee456739e5a29b8eec8363235ca069823d941212737b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9627

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://ketchas.ru/square?utm_term=pdf+reduce+size+of+multiple+files
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f064de98e33d2cebbcdaa1/1626367198848/sprinter_sit_up_exercise.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee00ffc6126f45c3e5bd63/1626210559716/kunavokevu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec71344c0b954f9ea25f8f/1626108212817/luvogepekobo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec852efa40056e74d26fb6/1626113326924/cute_small_lap_dogs.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e76b775b53b90d7029d0c7/1625779063866/49941434485.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edc409a50f6e33a3217404/1626194953341/computer_car_racing_games_free_download_for_windows_7.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec83abef188817f7e168fa/1626112939495/sweet_noodle_pudding.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec991bbcf8be39b5073111/1626118427580/lee_county_water_and_sewer.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_off0000e45c.bin
4724aaf37c9a8f970f1fec8dc3e35bf7773adfca75fcbe7e3ba593bf7f8a3a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16640 bytes
font_01_sfnt_off00010f9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 16792 bytes
font_02_sfnt_off000127b4.bin
1e51460740fe30a65fbbb01867c1e430394c557aab2298868a9e1fbc15167b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 10676 bytes

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