Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8580b03b57c961…

MALICIOUS

PDF

77.4 KB Created: 2021-03-14 02:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343b11f99fb3b76da1610e10225031d5 SHA-1: e9d1f33d415b4b0dfcd8822e325a2498fbaed827 SHA-256: dd8580b03b57c96140d11505cdb2dabefebeb8220a91c34a4f98b1f34b3b48f3
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to accounting records, likely intended to trick users into visiting the external URL for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=que+son+los+registros+contables+pdf
    • https://cdn.sqhk.co/tejikeluz/y7ejckL/rugirojogi.pdf
    • https://cdn.sqhk.co/jigitovewuk/fjcmjc3/96008228848.pdf
    • http://obsluzhivanie-kompyuterov.moscow/73011889187pi5dy.pdf
    • https://cdn.sqhk.co/jezaziritav/jgig6AS/capital_radio_top_40_playlist.pdf
    • http://garderob-podolsk.ru/asus_router_ac87u_setupry3y4.pdf
    • http://fiwusenipabaj.iblogger.org/coliform_in_water_definition.pdf
    • http://pixxel.life/17328710658n64zb.pdf
    • http://jududijixemuvov.22web.org/darasefifa.pdf
    • http://static-start.top/dewalipimitunelugevaxomt56r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/20fb8041-e122-44f9-8358-b18554c65734/diablo_3_necromancer_build_nintendo_switch.pdf
    • https://uploads.strikinglycdn.com/files/bb5e896e-c857-4076-8c4c-5a2d7cf12ae6/25405496196.pdf
    • http://luselobek.epizy.com/record_background_blur_videos_android.pdf
    • https://uploads.strikinglycdn.com/files/917ef1bc-6470-498e-aefa-302d67d39f6e/math_kangaroo_2020_registration_deadline.pdf
    • https://uploads.strikinglycdn.com/files/40157648-dcf5-46ad-b086-2ceafefdb2c0/36336668884.pdf
    • https://uploads.strikinglycdn.com/files/7cca7021-6522-4107-af9c-5bbf9f228833/chaos_theory_butterfly_effect_tattoo.pdf
    • https://uploads.strikinglycdn.com/files/e2d667cc-828c-4363-b662-216dcd4742e3/universal_methods_of_design_expanded_and_revised.pdf
    • https://uploads.strikinglycdn.com/files/668d8ad3-5b11-4588-bfa0-4c3906f65f9d/gokasuxenelupoxorozudinib.pdf
    • https://uploads.strikinglycdn.com/files/e69a867e-7a75-4865-be71-e50002bca7a0/how_to_factory_reset_polycom_without_password.pdf
    • https://uploads.strikinglycdn.com/files/f2823c85-afe7-471a-9ed6-fb9b0cfb3971/how_do_you_change_immersion_heater_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/5aadebc7-6b57-4370-be4e-bde74bdf721c/94780851061.pdf
    • https://uploads.strikinglycdn.com/files/f6072378-9db9-41d5-9e6d-6f871d930281/70278740306.pdf
    • http://rupegofiminatef.epizy.com/sugijozuv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec18.bin
04ba5f79c0041a1edb0458e8599c698a9df9de84aae1efa357f8a26966161518		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5524 bytes
font_01_sfnt_off0000feeb.bin
d31e3b0dba62f7bf0ad48cd5ad67fdddd27ddc917b409d86e05b770e7b06bd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 12204 bytes

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