Malicious PDF — malware analysis report

Static analysis result for SHA-256 d194275c42dfe66d…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 14:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95a45fcf0ba7953dffd6aec01d83520f SHA-1: d742288dd3709f8555aa4ea39e0b6b4764bdd5eb SHA-256: d194275c42dfe66d646498d4d110ea48f512c1e08da62285ccbd95a90e5a479f
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially obfuscated, suggests a lure related to essay writing, which is a common tactic for phishing or distributing further malware. The presence of external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7551

Heuristics 4

  • 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
  • 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://scripts.sil.org/OFL

Extracted artifacts 1

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