Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a2e7c90efd53a5…

MALICIOUS

PDF

77.1 KB Created: 2021-03-08 23:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c14c54ec70fb88d7d63d8293550f9e SHA-1: e670933021801b859a04a385ac3986603b9e5db6 SHA-256: e1a2e7c90efd53a54927d1001876a8db87623b24c0af45e801f5b0af602d9430
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains text related to 'kingroot apk v 6.0 1 download', suggesting a lure for users seeking this software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://kuzutuzo.ru/wix?keyword=kingroot+apk+v+6.0+1+download
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/visonuref.pdf
    • https://cdn.sqhk.co/sugifila/oxuuhjM/sutasupivoxelov.pdf
    • https://cdn-cms.f-static.net/uploads/4500878/normal_6034721700b27.pdf
    • http://ogranicbio.space/download_sanam_band_all_mp3_songs9of48.pdf
    • https://wonumizesux.weebly.com/uploads/1/3/4/6/134631676/21435.pdf
    • http://vizit.store/plastic_deformation_definition_bone7um2p.pdf
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fec88b3afef8.pdf
    • https://cdn.sqhk.co/jepivitixiwo/3vhbLhh/reincarcare_cartela_orange_in_strainatate.pdf
    • https://wupibivuvofat.weebly.com/uploads/1/3/1/1/131164023/jiwego.pdf
    • http://smartradiobf.ru/25054151262wi0sn.pdf
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60217dffc3302.pdf
    • http://tesocoin.online/678281680603qaq1.pdf
    • https://cdn.sqhk.co/zogobadakedu/eibjiRI/virus_protection_for_ipad_ios.pdf
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/mugipud.pdf
    • http://voirlo.xyz/is_it_bad_to_average_up_on_stocks06m6c.pdf
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fe57b82189f5.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_601f0e014764f.pdf
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fe3aec3d3c2e.pdf
    • https://cdn-cms.f-static.net/uploads/4468268/normal_60258cb20ccd7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42fa4ea2-94cc-4561-8095-4092cdabaaec/beetlejuice_dantes_inferno_room_funko.pdf
    • https://uploads.strikinglycdn.com/files/25cd1a4d-1cea-4977-abb5-676f972d40d6/descargar_canciones_de_ana_gabriel_gratis_para_celular.pdf
    • https://uploads.strikinglycdn.com/files/2c0342c5-7235-4b69-92b2-0623a70c6b31/why_does_my_cats_eye_bleed.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_off0000f022.bin
74185548dd565cd57a1b129cef53d714ee158dc973593a415567bfc11323e089		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 5512 bytes
font_01_sfnt_off00010325.bin
b57e3a30251fff07f7e84128fa8b1b7a2469a5fd98ac685db8333aa2f4376024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10596 bytes

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