Malicious PDF — malware analysis report

Static analysis result for SHA-256 0473e93e2aaccfe1…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 14:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf23daac94e8f5ae8ece20d6c634515 SHA-1: 7ec1de4c883f344bc2339b9a149d06f6a695ece9 SHA-256: 0473e93e2aaccfe13c37f5d8146e52e0afdf45dbdb73b0b287bf15cd95221335
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. The embedded URL points to zajinet.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Neverwhere' and PDF downloads, suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=neverwhere+descargar+pdf
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fe35a3f35382.pdf
    • http://tamakar.tech/sabre_dance_piano_sheet_music2l6hr.pdf
    • http://wubowobipevoto.mywebcommunity.org/zuduvujavapuzasusifuzow.pdf
    • https://cdn-cms.f-static.net/uploads/4421209/normal_604150b38a3f2.pdf
    • http://dlkmvkoenv.info/fujuwateprcynk.pdf
    • https://cdn.sqhk.co/wemorapi/ieDiigd/17338189202.pdf
    • https://cdn-cms.f-static.net/uploads/4392209/normal_601304fdd688a.pdf
    • http://zezasarasojid.mywebcommunity.org/wotiju.pdf
    • http://mnatural.space/supernatural_bobby_singer_s_guide_to_huntingxmuhp.pdf
    • https://cdn-cms.f-static.net/uploads/4444623/normal_60247cbf0fc70.pdf
    • https://cdn.sqhk.co/risubibasero/gEASYhf/vixajagisur.pdf
    • http://bettyloustintruckbbq.com/fallout_4_miami_mod_download_pcegm1i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mawesenasijoser/burnham_gas_boiler_tech_support.pdf
    • http://woxikajir.myartsonline.com/89259724007.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_318f7355be584458bdf5eee23cf7d26f.pdf?index=true
    • https://s3.amazonaws.com/lezopobigeza/zudekibepakilonip.pdf
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_900e7fb293a940609e2adbc81cc866bb.pdf?index=true
    • http://xamukipadu.myartsonline.com/rinokusebiwusimiwewuf.pdf
    • https://s3.amazonaws.com/teximikamukubo/jepasatimew.pdf
    • https://s3.amazonaws.com/sajezife/how_long_does_it_take_to_detox_mercury.pdf
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_1c4ab2e9589d4898b78785730f43435d.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_off0000f1e8.bin
4e69bbfb1f2f19770fdf5bca67958c8a45c1031ab27b9ca2f82d3c235f25da2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 5504 bytes
font_01_sfnt_off000104b8.bin
992315b7afa541c246418d50ae298d4c0c52fa89e22a406eca06571bc34ece04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 2012 bytes
font_02_sfnt_off00010e60.bin
8af8e1b48d65b578a81e5c3209b87a19bd8b9a23c2a5c757aae5dbc6eaa7c1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10808 bytes

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