Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cd659ca4debe41…

MALICIOUS

PDF

97.2 KB Created: 2021-04-19 07:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef45f257aad309a5d9219fee907bb4bb SHA-1: 2c01621025f225f5c8ecb384124dc52277b69215 SHA-256: f3cd659ca4debe41d197f371c3d194b78d23ad630cc2194947009486f846de8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains an embedded URI that points to a suspicious domain, likely intended to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=agatha+christie%2527s+poirot+season+1+episode+10
    • https://cdn.sqhk.co/nerurepaza/rkDgchh/skyblock_for_minecraft_java_edition_1._15._2.pdf
    • https://cdn.sqhk.co/kugefiruxat/bhc1gg4/happy_glass_game_download_for_pc.pdf
    • http://tewavel.iblogger.org/50223807589.pdf
    • http://zitupow.medianewsonline.com/how_to_replace_belt_on_bissell_proheat_shampooer.pdf
    • https://cdn.sqhk.co/xolofiwano/aohhgjv/stadia_exclusive_games_list.pdf
    • https://cdn.sqhk.co/nekuripafi/eidiaZ4/asphalt_street_storm_racing_mod_apk_an1.pdf
    • https://cdn.sqhk.co/nodezaneripe/gjjQZRo/puvedidakozunewexeg.pdf
    • http://ganitigusawev.mygamesonline.org/cardiomegalia_fisiopatologia.pdf
    • http://jenerotisa.mywebcommunity.org/76902670902.pdf
    • https://cdn.sqhk.co/nurijodefa/iaI6n3Q/78228962437.pdf
    • https://cdn.sqhk.co/nikazurokuv/dhe5hj1/79400969535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/92f20639-5068-4ac2-a6c2-116f05b9631e/kexutoxozizasuvupuxusedep.pdf
    • https://uploads.strikinglycdn.com/files/9d7fc2db-569d-48a1-b0a2-942ff0a5bd90/childe_harolds_pilgrimage_canto_3_analisi.pdf
    • http://teposowadu.rf.gd/zerugog.pdf
    • https://uploads.strikinglycdn.com/files/dc3ed5fc-bf83-46aa-ad48-d1557d1a23cc/how_much_polar_bears_are_left_in_the_world_2020.pdf
    • http://zivexotafoni.myartsonline.com/gazetted_officer_certificate_for_aadhar_card.pdf
    • https://uploads.strikinglycdn.com/files/1d56b0ed-7e63-46f2-8403-499297cc4e3c/how_to_crush_ice_in_oster_blender.pdf
    • http://geduzesibasax.epizy.com/farazopidigusena.pdf
    • https://uploads.strikinglycdn.com/files/e2ba948c-1a6e-43fa-8ec9-286f32f0588b/ford_mustang_convertible.pdf
    • https://uploads.strikinglycdn.com/files/1b638910-551b-4cb0-8d88-239e6eedbfbd/how_to_reset_an_hp_officejet_pro_8600.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d80.bin
34775c83442fd747d37489fa928c0e9c86746360ea8c1341049f963607f80eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 5308 bytes
font_01_sfnt_off00013f8c.bin
210eb911a44ae5449b8a1a85124a101d14cc9e719cdb6d9db554e6fec81f3856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8C 11636 bytes
font_02_sfnt_off000166c3.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166C3 4324 bytes

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