Malicious PDF — malware analysis report

Static analysis result for SHA-256 524316e608143643…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 17:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30d11a9f959d991b3754eb5b7fa3aad SHA-1: 82def92b6ef0fa42475788e3e77d0bfa0f6a965b SHA-256: 524316e6081436433099aab561e5b650cf48d03602ebd1a45d9adb331b7b6bcf
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to stock listings and application metadata, which is likely a lure to encourage users to click on the embedded links. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=can+a+stock+be+listed+on+nyse+and+nasdaq
    • http://tifoxikutawe.sportsontheweb.net/wedaxebamisixapifola.pdf
    • http://xifadezuzurap.medianewsonline.com/bonupomab.pdf
    • http://mutuvukawawe.22web.org/an_introduction_to_the_theory_of_aeroelasticity_download.pdf
    • http://kirakexig.mypressonline.com/que_hacer_si_me_chocan_en_estados_unidos.pdf
    • https://cdn.sqhk.co/rogekanus/CPgcDRi/28237607197.pdf
    • http://gitulozoripuk.22web.org/adiabatic_and_isothermal_compressibility.pdf
    • http://jasovawuke.22web.org/97585710988.pdf
    • https://cdn.sqhk.co/timafewa/b2ghgN3/11am_pacific_time_to_hawaii_time.pdf
    • http://jinoxiresajigeb.iblogger.org/salozepaxamul.pdf
    • http://beviluxenumiliv.mywebcommunity.org/bofuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bojisunizinop.epizy.com/lawn_boy_user_manual.pdf
    • http://seguwogira.rf.gd/tifen.pdf
    • http://kalogoraretupo.epizy.com/golwala_clinical_medicine_book.pdf
    • https://s3.amazonaws.com/juvetaso/overwatch_blizzard_free.pdf
    • http://kimigabajo.epizy.com/inspirational_life_quotes_sayings.pdf
    • http://rubuvajaroxe.epizy.com/49353999114.pdf
    • http://nidemavaguwagev.rf.gd/avast_update_definition_free.pdf
    • https://s3.amazonaws.com/fasudikek/14683181684.pdf
    • http://marudemaxewuv.epizy.com/4928590281.pdf
    • https://s3.amazonaws.com/wujixus/jajunorawozixamunaluze.pdf
    • https://s3.amazonaws.com/viwoxuz/vuwotonivanelazidugufiku.pdf
    • http://fabibupotiliba.epizy.com/kobalewozukusuzebozogiza.pdf
    • https://s3.amazonaws.com/xugigabitulu/nixunejafezetifizokemijux.pdf
    • http://getojigukas.epizy.com/galonosotapegu.pdf
    • http://winuvifenam.epizy.com/ralamagojafag.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_off0000eb5e.bin
3d7a264dd25e710637925078212601cc7416b2e0902d4a7ff27c10f41ffbf45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 5176 bytes
font_01_sfnt_off0000fd0e.bin
91cfdaa7efa71d23d13e317cec671e43f88c8d452c1c1fa04ccc5c076430742f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 11324 bytes

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