Malicious PDF — malware analysis report

Static analysis result for SHA-256 919177132550c0c6…

MALICIOUS

PDF

69.8 KB Created: 2021-09-21 02:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 400783753ecb7e3814f8812cfb04afb6 SHA-1: 177ebe28cbca8cc628566c965f328f022561a21c SHA-256: 919177132550c0c64ad8bbca7ded4f2c14f38bcd8dc3526cda30d3f25dcc50c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true malicious destination. No scripts were extracted from this sample, but the high number of suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=gr+words+list+for+kindergarten PDF link annotation
    • https://jagamimpi.net/contents/files/tumirasomeri.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zibebaz.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/sijuber.pdfIn PDF document text
    • http://bamila.vn/luutru/files/42135446054.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/99841938714.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/95030439118.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/lapuvumiriwatomobusi.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/rerobi.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/1536806489.pdfIn PDF document text
    • https://windsbs.biz/files/file/joruxuwazimumutaxejuve.pdfIn PDF document text
    • https://bloc-immo.com/images/wemapan.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/74405912368.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xamajaluvalepuj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137597bef9d9---zirerelatuvatezu.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210920070917.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33938272189.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sevewominizaf.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/pigeligugikaguwizekofure.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xalumojej.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ad94374ba983dd053145eba8faed1dcb/91261506386.pdfIn PDF document text
    • https://12shio4.com/contents/files/davunadapega.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/sexijunojezisanag.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/35953795474.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/lomuzot.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C9 15568 bytes
SHA-256: 9fffccd0f6de16895d67bd9a8173fe22268f6461ad5c00bc9fa78a35d4cec44a
font_01_sfnt_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 10744 bytes
SHA-256: 641db78d8bcfc9aa9ca59fdf68d589151494c20ce9a36cdb5e4e27e7245083fa

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