Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a79b4a8204d215e…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 23:04:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2917b9b5ca45ce2ce00c1cd5e731ece1 SHA-1: a6f17b959cac4bf2e9e297b02542a73c8df39bb6 SHA-256: 8a79b4a8204d215e0f5906389ca6fb7af0e7a8cabd0b300b06909b76eacfeb01
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a redirector for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily corrupted, contains fragments related to registration and potentially lures, aligning with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+register+for+boy+scouts PDF link annotation
    • https://cdn.sqhk.co/nazujovo/gdOgtxS/domabiwojugotolejakito.pdfIn PDF document text
    • http://nivawegokex.22web.org/advanced_systemcare_pro_3_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/jjc7iap/white_triple_s_sneakers.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/jiZywig/8_ball_pool_hack_cydia_2020.pdfIn PDF document text
    • http://rukofuvifoti.22web.org/new_big_nate_books_2019.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/2019_editable_monthly_calendar_templates.pdfIn PDF document text
    • http://tekijanimawov.22web.org/piwit.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/3gcD9gp/the_wolf_of_wall_street_trailer.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/does_disney_plus_have_a_samsung_tv_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/3mKjfha/tokaido_matsuri_expansion_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/21360966404.pdfIn PDF document text
    • http://repofifimi.epizy.com/80002684793.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/valavunufezesodifij.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/59962269906.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/catch_me_if_you_can_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/touch_blocker_disable_touch_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/piroduzugaje.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_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 5104 bytes
SHA-256: 644ac0e28c62652fa90ac6cf801f9d25ff9faab8401664ea9675fdd67e0efbcf
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 11224 bytes
SHA-256: d839a1534a78aa8031d6f4fa9eed29dfe67ef81915db0e5e18165fe4f4ce28c7

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