Malicious PDF — malware analysis report

Static analysis result for SHA-256 f821df0b1652eef6…

MALICIOUS

PDF

87.9 KB Created: 2021-05-08 08:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2679844e3e23ea991956a152946093fd SHA-1: ccc5dba09fee0d8b90ea7a11c06ab63ff327a7ee SHA-256: f821df0b1652eef6ad0c1b3371145244538b2038487a4198aee1295c14cab3ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic indicates it's a link farm designed to redirect users. The document body, though heavily obfuscated, contains a string that appears to be a search query for a popular book, suggesting a lure to trick users into visiting the malicious URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=did+percy+jackson+die+in+tower+of+nero PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369189/normal_6069a2f6a3d73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369153/normal_5ff78a4e8e8c7.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/sportline_4065_watch_manual.pdfIn PDF document text
    • http://lajafago.medianewsonline.com/dr_kambikuttan.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/iEc7QGl/castle_of_illusion_playstation_store.pdfIn PDF document text
    • http://sebotad.iblogger.org/lijozusivaxizegodil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5fddf65ea9ceb.pdfIn PDF document text
    • http://iglivesupportteam.com/ponobizunedofemotizidu58zfu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5ffb742a51192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_6001e85165916.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/asbestos_awareness_training.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/gjbZhgF/is_the_real_ivan_the_gorilla_still_alive.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/ejjkgd1/jurnal_hernia_diafragmatika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5ff84552c0b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5fdb5b4056331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5fdc5b5f586d5.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/deloitte_company_overview.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6057f38864ef1.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/hardest_sat_math_problemsk9jqh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legabukev.epizy.com/can_i_study_english_and_work_in_canada.pdfIn PDF document text
    • http://kosatalek.rf.gd/added_upon_nephi_anderson.pdfIn PDF document text
    • http://vefejabenu.rf.gd/62488752889.pdfIn PDF document text
    • http://biborufa.epizy.com/9684371431.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_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 5448 bytes
SHA-256: 0d55c23f2ab7718bf633b7b6596498765234ea5aea376b9dc36229b583bf65d3
font_01_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 10744 bytes
SHA-256: f4aef01bc2dfd7baadd749abd22240d87e6bcf33a8adb84e21b7fc8374f1401c

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