Malicious PDF — malware analysis report

Static analysis result for SHA-256 4968e472bf449e75…

MALICIOUS

PDF

92.6 KB Created: 2021-03-18 06:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07acc9ba7a793590d2b0fafcb505a89 SHA-1: 79385abbb950bf56c0c04163e6fdd4fd208b1a3a SHA-256: 4968e472bf449e750ae8776718332c45194c6a0bfb11c291f59af0ad6b5cf0a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to zajinet.ru. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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/wix?keyword=samsung+tv+service+menu+manual
    • https://cdn.sqhk.co/papebikuwi/cFieFjb/warren_buffett_stocks_to_buy.pdf
    • https://cdn.sqhk.co/letowajaf/4sKggcs/nuwebilaxewatelo.pdf
    • https://cdn.sqhk.co/sidogorego/cS2cwib/super_world_jungle_adventure_castle_trap_new_vegas.pdf
    • http://wumomotetidofe.getenjoyment.net/7657218177.pdf
    • http://botefin.medianewsonline.com/rockola_jukebox_model_488.pdf
    • http://ing-jobs-opportunities.com/complete_warrior_3.5_featse5ybb.pdf
    • http://lazotub.mywebcommunity.org/23435884486.pdf
    • https://cdn.sqhk.co/wovenebi/haejfgg/horror_clown_survival_game.pdf
    • http://ontrade.top/how_to_check_answering_machine_remotely2t5fr.pdf
    • http://fajujefa.getenjoyment.net/what_god_says_about_mother_in_laws.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pusixa/how_to_use_fender_mustang_lt25.pdf
    • https://s3.amazonaws.com/kovozenamofox/tegizile.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_efc94c4f77994fa38a5646241c8798fd.pdf?index=true
    • https://s3.amazonaws.com/nemafu/how_to_set_volume_on_fios_remote.pdf
    • https://s3.amazonaws.com/luxelula/52787695928.pdf
    • http://kadoxosin.atwebpages.com/xumapokigelafusewuv.pdf
    • https://s3.amazonaws.com/nijosinizo/recuperar_bloc_de_notas_android_huawei.pdf
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_2fdaa93079264727ab544cd2182c41fc.pdf?index=true
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_6db622fc30bc489fa2e30640a721eb01.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e06.bin
d652c204edbf1c50aa4714cc4248d939239d46e868c782921c14a0626dce7be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 5056 bytes
font_01_sfnt_off00012f14.bin
98ab37c8c0f973e80e59ceef7aec2b529a323763d55534c738c3c913b5b16a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 11272 bytes
font_02_sfnt_off00015587.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15587 4324 bytes

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