Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd39e6204d4092c…

MALICIOUS

PDF

99.5 KB Created: 2021-03-24 00:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e2561c4e443249674e566b16d87aff2 SHA-1: dbaafe7765979c15a8693f12690fde9ce5d0aba3 SHA-256: ddd39e6204d4092c4b745835cf10d56d0524cb9b0d7844e253bc26ca1a239262
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI that points to a download link for another PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URI, https://jacksth.ru/award?keyword=english+grammar+book+round+up+1+pdf+download, is the primary indicator of this malicious lure.

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://jacksth.ru/award?keyword=english+grammar+book+round+up+1+pdf+download
    • http://alluniversity.fun/orgulloso_de_ser_chapin_nelson_lealb3nw7.pdf
    • https://cdn.sqhk.co/pasivuzuke/XRhciiZ/lowakofop.pdf
    • https://cdn.sqhk.co/webunojixisa/Cwmjg29/vegovapulolakilavatu.pdf
    • http://bikelumonekodex.mygamesonline.org/bnf_and_ebnf.pdf
    • https://cdn.sqhk.co/nemalerute/frieFjb/call_of_mini_zombies_2_multiplayer.pdf
    • http://xunopapazugatar.medianewsonline.com/artritis_idiopatica_infantil.pdf
    • http://community-day.ru/hillsong_non_stop_worship_songsu68cz.pdf
    • http://kyrgyztours.com/tamumokolulekefuvepg2oo.pdf
    • http://prechambre.xyz/wizezesonarajozamebd5yd.pdf
    • http://kprovk.xyz/csgo_knives_for_freec3mz6.pdf
    • http://trellos.fun/alfresco_community_4h3jmp.pdf
    • https://cdn.sqhk.co/movumatoz/2gfFLjg/1673756473.pdf
    • http://gufutaca6.xyz/m._u._g._e._n_unblockedaef7e.pdf
    • http://alfa-quest.ru/1988065278ly55d.pdf
    • https://cdn-cms.f-static.net/uploads/4462035/normal_600b78ac2dffd.pdf
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcb23c0ccaec.pdf
    • http://changepass.online/how_many_calories_in_a_latte_made_with_oat_milkdky8z.pdf
    • http://xsale.trade/lijekakekukegwbm4.pdf
    • http://taptopbot.com/oracle_database_interview_questions_and_answersd1647.pdf
    • http://reduslim-shop.website/sea_of_thieves_codeimdok.pdf
    • http://dawexefif.getenjoyment.net/31633886039.pdf
    • https://static.s123-cdn-static.com/uploads/4465949/normal_5fe426605e00f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pulitisagot.atwebpages.com/93273331027.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_off00013050.bin
6e59a8b359cc969463ebb27e3dd6a8bb12d444de996f72ce7bba7b0f45c1743d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 5444 bytes
font_01_sfnt_off000142a5.bin
08aec1213d6db5465caa23c2bcd32cba8c2e53c88ae61e173131de3a072a54b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 14384 bytes
font_02_sfnt_off00017205.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x17205 4324 bytes