Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bda5dd5bea3338…

MALICIOUS

PDF

81.8 KB Created: 2021-07-22 01:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f113ba880728d4b1c669abcd69de967 SHA-1: f309ff6b52c9880bc16ff39456535183cf13dfb1 SHA-256: b3bda5dd5bea333854e28c71570bac5f55c942f69b86a9829ad831d5072709dd
136 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's primary purpose is to trick the user into installing a fake browser extension or update. While numerous URLs were extracted, they are all marked as benign and likely serve as decoys or part of the lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/9xivtwLAy4k/square?utm_term=linear+equations+for+class+6+cbse+worksheets
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4867eb84a576e6c0cf6f9/1626637950384/52912546687.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee064fe6792c2552bf38d2/1626211919752/watch_meet_the_spartans_online_123movies.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f4945fd9389f5e809ba7cc/1626641503380/highest_grossing_actor_of_all_time.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee78e7b1dcdf258dab31ea/1626241255483/the_wall_full_movie_online_free.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f55eedb84a576e6c17ca20/1626693357957/anti_blocking_agent_for_paint.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e911692a6f785f5833c153/1625887081347/simpsons_tapped_out_cheats_2021.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f7f79df668a559cd9a5ad1/1626863518030/41702778546.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e85e9db402d36f42288301/1625841309918/dikuzivo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f89d383515ea3202487d36/1626905913258/things_to_do_in_nur_sultan.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f26ff029712869f05d772d/1626501104698/98623187752.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee5fc38685745b7d173a92/1626234819746/dramatic_piano_sound_effect.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee2d66115d504d3a851898/1626221926319/44448485322.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e929d6e370ac6322893ef4/1625893334674/32766623770.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5ac7ddb4cc01f9bca61ba/1626713213095/hero_word_formation.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2d01036db64625199ea10/1626525713041/all_dc_animated_tv_shows.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9e9b7dc7460dd09d5d4e/1626119835882/gagavizutuvomududaset.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3995a29712869f06a5038/1626577242598/mumokakijabof.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f89c2c15b3010569c77f40/1626905644806/png_to_webp_php.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f8938af6b38207f7343d58/1626903435318/descriptive_words_that_begin_with_h.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e78d1551cb2a526cf83365/1625787669138/19341453085.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_off0000d8fa.bin
a5ff5683bf574ab8d3a650e04b41c2acb81a5d5223244342c22d346d0cf05fea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 16816 bytes
font_01_sfnt_off000104ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
font_02_sfnt_off00011cd1.bin
12015e6962e40651c46428fbdb3f25545358fcf060be3a424322286363663b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 11120 bytes