Malicious PDF — malware analysis report

Static analysis result for SHA-256 efab676fd34ae1eb…

MALICIOUS

PDF

76.6 KB Created: 2021-05-16 08:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7d91149cc2841c1b3b602fe1ce6245 SHA-1: b310c3e00cc108f9e99ef5b5065be4679f0c4b10 SHA-256: efab676fd34ae1ebeea6596b401288f91648ee3961b3c62d8a157094fdf1d546
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The embedded URLs suggest a tactic to redirect users to potentially malicious content hosted on various domains and cloud storage services. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn.sqhk.co/pimibopugugo/goHEUja/cup_stacking_challenge_worksheet.pdf
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/kasiroxetus_nozufav_xuxebekugose_toranepepekases.pdf
    • http://lnstagramverifiedbadgeservice.com/gorolopirelorizuludoxexixeee2h.pdf
    • http://instgrmmverifiedbadge.com/ujs_portal_pa_court_docket_sheets66xj3.pdf
    • https://kinamolifurepe.weebly.com/uploads/1/3/2/7/132710726/2a80b.pdf
    • http://chtotakoebezuz.biz/tubugudiwasalinarijxy4h.pdf
    • https://supeneti.weebly.com/uploads/1/3/2/8/132815050/4d5f23882aad17.pdf
    • https://cdn.sqhk.co/tiluzegata/AeheWat/35991613403.pdf
    • https://cdn.sqhk.co/mekurapiw/geMhfjg/wilderness_survival_movies_on_netflix.pdf
    • http://latencfsrt.space/xetumizawoxatepanaurt00.pdf
    • https://zipakodexosif.weebly.com/uploads/1/3/5/3/135344546/xaresapajewur-mawodegatedole.pdf
    • https://cdn.sqhk.co/kavejufa/ghijXij/burobetigupifebiwak.pdf
    • https://cdn.sqhk.co/bafuberudod/gmbibUT/the_maze_runner_book_1_pages.pdf
    • https://cdn.sqhk.co/bikuloxisage/gi2gjNv/76781874496.pdf
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/tegakupudeze_datomigojebiros_posimef.pdf
    • https://cdn.sqhk.co/fetedudi/Khg4wjh/whatsapp_install_google_play_store_app.pdf
    • https://cdn.sqhk.co/virurewev/epg2aEa/56701343294.pdf
    • https://cdn.sqhk.co/javeduner/Q8hajba/lokarobifogula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=vizio%20e601i-a3e%20remote
    • https://s3.amazonaws.com/pewebopufupe/5110476984.pdf
    • https://s3.amazonaws.com/tamobalasu/kitchenaid_artisan_stand_mixer_-_matte_black_ksm150.pdf
    • https://s3.amazonaws.com/vukumesoj/jebos.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_a4e35f5e600d4640a9a3f03a4d83fac4.pdf?index=true
    • https://s3.amazonaws.com/taturi/canciones_y_acordes_de_guitarra_gratis.pdf
    • https://s3.amazonaws.com/saziwijaxodav/jitajadixosuxariv.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_f7fe3899122144fcb54b4c15b91e7cc7.pdf?index=true
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_e5bd4665ab7c4aa087115e8fafa2fdd3.pdf?index=true
    • 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_off0000ef0b.bin
0e14c5b6496eec24f360037489adf3142a7fa22655c81a835d4133e3e0e88e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 5180 bytes
font_01_sfnt_off000100ab.bin
b41cf5f46ffee93942fec180b0718275394a8c3ea1466a9d40318db19dde7e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 10580 bytes

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