Malicious PDF — malware analysis report

Static analysis result for SHA-256 099315c4b0af6b5a…

MALICIOUS

PDF

76.8 KB Created: 2021-07-18 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33e9b1b2b767feae0154c9a1288c7a3f SHA-1: a92d3708dac3bff8501c8650315b0e40e5dcdda4 SHA-256: 099315c4b0af6b5a12e0e8b2d69ebced4b7a3f93e08b2046b9bb3b215d58f5a9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by multiple heuristics as malicious, including a specific rule for browser extension installation lures. The ML classifier also assigned a high probability of maliciousness. The document likely aims to deceive the user into downloading and installing a malicious browser extension or update, which is a common method for credential theft or further malware deployment. No scripts were extracted, and the document body was unreadable, but the presence of the SE_BROWSER_INSTALL_LURE heuristic strongly indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/~3/5VO7y1TeAqQ/square?utm_term=h264+to+mp4
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd030cb43530604a66f87/1626198064143/mowenewuzixa.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7f770cf33f708d79f1b5/1626111863376/cisco_internet_of_everything_final_exam_answers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee2626ab0cb8743be2d29c/1626220070663/xibilev.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f37e14952f835132d76414/1626570260277/eugenie_and_jack_brooksbank.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7f256efb14d1122122e6a/1625813590293/dipezo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee87b07426fb5109f8ba34/1626245040554/your_bible_and_you.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f091df69039050ca01d09f/1626378719630/images_of_im_injection_sites.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edbfea6d720f75fb5d509a/1626193898725/summary_of_self_reliance_by_ralph_waldo_emerson.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_off0000d059.bin
5deb0a80301d71f5cd2478d9b5ced48dd8f54611c6452bed1a4cad778d9b40e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 9968 bytes
font_01_sfnt_off0000e677.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 16792 bytes
font_02_sfnt_off0000fe89.bin
ff96355315c7821367fab40c242e29401bbc45f20cfe8aac9b779142fbbeca77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 15832 bytes

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