Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d0f0f6bf23e7e0…

MALICIOUS

PDF

85.6 KB Created: 2021-04-07 14:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe59dd82749a741c5963143889de0a5 SHA-1: 77ab486e3f77568985a96aeb62293308a5e76bf6 SHA-256: 91d0f0f6bf23e7e066b8beb7bc8f3eb54c794e19f6c0067f9b28632b9ea85f2b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or distribution point for malicious content. The document body, though partially corrupted, contains text related to essay writing, which is likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+write+an+essay+hook+sentence
    • http://lajibodomemebev.66ghz.com/autocad_2014_software_free_softonic.pdf
    • https://cdn.sqhk.co/rovifatira/fi69gXw/rainbow_stacker_toy_pastel.pdf
    • https://cdn-cms.f-static.net/uploads/4459937/normal_6066f993074e0.pdf
    • http://bukezisafa.iblogger.org/digasoragokukigukoxozex.pdf
    • http://xajabuzowa.scienceontheweb.net/taller_alimentacion_saludable.pdf
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/4385159.pdf
    • http://mudixefibewab.mywebcommunity.org/philip_roth_american_pastoral.pdf
    • https://cdn.sqhk.co/metusoteliza/mieidij/vamomuga.pdf
    • https://cdn.sqhk.co/semiwewedazi/74lDhbD/kasomerenodivewajimuvum.pdf
    • http://pigokakiw.iblogger.org/similarities_between_rationalism_and_empiricism.pdf
    • https://lovapunosarimol.weebly.com/uploads/1/3/5/4/135401421/194572.pdf
    • http://jerusitujuj.22web.org/13854291851.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/pupatup.pdf
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/nugen-vulevujawanusi.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_60540d6c5b67e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gewuruso.epizy.com/38696094180.pdf
    • http://vakezedawu.rf.gd/aula_internacional_1_2020.pdf
    • http://lazuletezofik.onlinewebshop.net/meaning_of_development_studies.pdf
    • http://faligesiba.rf.gd/how_much_does_a_medical_laboratory_technician_make_in_australia.pdf
    • http://bosefijov.epizy.com/20298733302.pdf
    • http://dapufojutujat.atwebpages.com/cabotagem_no_brasil.pdf
    • http://sowukosififu.rf.gd/difeze.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_off00011370.bin
c3dd5b1793b38e0c272a601b8adfc52844450255efef2587e17f0410fb963304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 5076 bytes
font_01_sfnt_off000124be.bin
b00463ab4859bd0955315ed01b819da1619df355991305d6219355069ee1c025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 10616 bytes

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