Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0850f634305556e…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 18:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5b70d46a30f5a2a1608058b9f621bc27 SHA-1: 380670885730d263e8be252f3f6a338e8870d815 SHA-256: d0850f634305556efae5478ca563b286c1bc5b1ddb629bdd71772a709a0c715f
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, designed to redirect users to external URLs. The embedded URLs and the document's metadata suggest a phishing or malicious redirection attempt, masquerading as an educational resource. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=evaluating+functions+independent+practice+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5fff14f8b2969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fe45cccc2c2e.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/jjagggi/jipefuzefukimemalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fca71c713ec7.pdfIn PDF document text
    • https://cdn.sqhk.co/gadakoferupa/DggUzji/tawebitogawifisowibom.pdfIn PDF document text
    • http://varietystore.website/robadatebpekd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_5fe74c13aed26.pdfIn PDF document text
    • http://wumorumomu.22web.org/zunamusukoxojezujure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_602b26b9745dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fc7dcd67671f.pdfIn PDF document text
    • http://upsbox.ru/scheduled_caste_certificate_form_punjabd86v1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_604665021a5ff.pdfIn PDF document text
    • http://jabalok.iblogger.org/brandon_burlsworth_arkansas.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/niagfji/59334320462.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/fXe74hb/vanilla_cake_recipe_easy_no_buttermilk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilunijo.epizy.com/miami_hourly_weather_report.pdfIn PDF document text
    • http://xekubot.epizy.com/free_printable_business_card_templates_psd.pdfIn PDF document text
    • http://gikosetopetidun.rf.gd/top_5_3d_animation_apps_for_android.pdfIn PDF document text
    • http://nexoradi.epizy.com/10757975923.pdfIn PDF document text
    • http://rusuxagek.rf.gd/internet_speed_meaning.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5692 bytes
SHA-256: eaf1cad570426829c664ab1fa227e0e8a721c17fe54196cde38c5a87aa87fcc7
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 11256 bytes
SHA-256: 1cbfb50fc3445d4b153e731e681079761ef01331bb5c44d9a4bf25d7e4b32c41

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