Malicious PDF — malware analysis report

Static analysis result for SHA-256 e023da16ea5a3940…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 22:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6399b23ffa757fb0f5a4c7577065a07c SHA-1: e2c291ad832100a76b65efd617edd0ac6cb7e82c SHA-256: e023da16ea5a3940ffcb324e30da795d8723fa27e684b2cb662920689e7e8fec
164 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to PDF files, suggesting a link farm designed to attract traffic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The document body, though heavily obfuscated, contains references to 'alien shooter isometric hack apk', reinforcing the lure of downloading potentially compromised software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=alien+shooter+isometric+hack+apk
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6055c92ce16f3.pdf
    • http://labiosdewonda.com/semicolon_sentences_worksheetbfqua.pdf
    • https://cdn-cms.f-static.net/uploads/4388169/normal_601a16bbd36af.pdf
    • http://leftoutclub.com/rozibo3lalg.pdf
    • http://krokoboko6.xyz/general_electric_universal_remote_codes_for_sony_dvd_playeraqcdk.pdf
    • http://electriccannoz.club/top_2020_songs_countryxqdcx.pdf
    • http://zezasarasojid.mywebcommunity.org/dawuforegifogijuzifa.pdf
    • http://zokidinodajives.getenjoyment.net/fewuno.pdf
    • http://feldhaus-klinker-plitka.ru/flexible_budget_reportrfbpb.pdf
    • https://cdn-cms.f-static.net/uploads/4388060/normal_601061c029706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_e6380e15be2c4699a442835fc6a9ee29.pdf?index=true
    • https://s3.amazonaws.com/wujafivabipo/kipabejuxulakasepusiwilif.pdf
    • https://s3.amazonaws.com/fapaga/totalekokonifugibagi.pdf
    • https://s3.amazonaws.com/lewuli/wexekupupukepe.pdf
    • https://s3.amazonaws.com/bezorito/coombe_dean_school_ofsted_report_2018.pdf
    • https://s3.amazonaws.com/dowavelaxam/sacred_geometry_shapes_art.pdf
    • https://s3.amazonaws.com/nazekisigiduz/29884038071.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_ff5834e2b4c24f9995689a71674001ee.pdf?index=true
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_deb19793bd5549cb949f4ba6489a0014.pdf?index=true
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_0d3693e2230344689377f4e55fb4e87a.pdf?index=true
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_40302f7b43e24b9490def643025c0696.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/87095394581.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_off0000ee09.bin
1438edab2a8ed5bf1a4fe7aa216c9a84cdc7adba10f0afdbb5d8f78044a3b79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 5224 bytes
font_01_sfnt_off0000ffa3.bin
49675f703f1a098e2b93bf6e84825f43b50c063caf54f8d8d5b100344028d43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11036 bytes

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