Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc633390df2de7…

MALICIOUS

PDF

82.4 KB Created: 2021-05-20 02:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177b92831bb5452e084608e330f977fc SHA-1: 67c15bf5f0deeb4e6d9d98adf4efda85a8abeb22 SHA-256: 78bc633390df2de7974289de7b6b4367ce67deb0ae45d6ef4ff5820f3401d04b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely used for phishing or distributing further malware. Although the document body is heavily obfuscated, the presence of the malicious URL and the overall detection strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=how+to+use+elite+digital+air+fryer
    • https://cdn-cms.f-static.net/uploads/4407081/normal_6034a094e6b5f.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_603de01accd72.pdf
    • https://cdn-cms.f-static.net/uploads/4426675/normal_605afee82d9e7.pdf
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fcd5048164e5.pdf
    • https://cdn-cms.f-static.net/uploads/4448126/normal_60222d2b44a44.pdf
    • https://cdn-cms.f-static.net/uploads/4459326/normal_605dc8c214754.pdf
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6034764de5c2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fewunadupop/53691393494.pdf
    • https://uploads.strikinglycdn.com/files/1eae20a9-291a-43d0-818a-8756639ae8bd/61920442617.pdf
    • https://s3.amazonaws.com/fulosobezur/xurap.pdf
    • https://uploads.strikinglycdn.com/files/b98b87cf-7030-47e1-bfe1-c6738f7813f2/how_to_call_forward_att.pdf
    • https://uploads.strikinglycdn.com/files/d22653b8-26c1-4c3c-90f5-d37d55fadec2/rolivewajewakajojuta.pdf
    • https://s3.amazonaws.com/dobesogum/branchial_cyst_surgery.pdf
    • https://s3.amazonaws.com/xopugup/does_pua_still_get_the_extra_600.pdf
    • https://s3.amazonaws.com/jolunenafobuw/11846140879.pdf
    • https://s3.amazonaws.com/tomamujuf/95765690080.pdf
    • https://s3.amazonaws.com/nasitevu/dewalt_drill_set_black_friday_sale.pdf
    • https://uploads.strikinglycdn.com/files/21979128-061f-4512-b007-531b1309f39b/how_to_use_a_electric_ice_cream_maker.pdf
    • https://s3.amazonaws.com/vebogotexaf/kovanefufigevu.pdf
    • https://s3.amazonaws.com/palikuvexake/bosch_oven_manual_set_clock.pdf
    • https://uploads.strikinglycdn.com/files/55f118a4-d162-4fd0-9361-819a331d82e2/levujejotabenegi.pdf
    • https://s3.amazonaws.com/kozewuposoridil/chamada_globo_reporter_meme.pdf
    • https://s3.amazonaws.com/gezetega/como_transformar_grados_celsius_a_kelvin.pdf
    • https://s3.amazonaws.com/fadupazageraf/cat_s_cradle_julia_golding.pdf
    • https://s3.amazonaws.com/tufitijinexu/how_to_factory_reset_micromax_android_one.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_off0001044e.bin
dd76ebb45e6eabd507382b602b58efbb54a5622c223c644f3156f7aa718e878a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 5228 bytes
font_01_sfnt_off0001163b.bin
2ddfdcc78258eeb2db69017eb0c6dd2ad56d45234ca4861ccebf2e256b7553cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 10960 bytes

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