Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb7bf896141efeb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-26 02:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c550122c2db2a22529a09634af3af2f SHA-1: 0c559ed174b394f5f067d66db04d246703d8d5ea SHA-256: 2bb7bf896141efeb328d658e8b0e131dc034c46be55ca3307a7e5c35bf760cf0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are linked to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=auto+tts+crack+version PDF link annotation
    • http://voijin.com/userfiles/files/libajek.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f133a9b1---99462391143.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/69546438095.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/jawojinizonebet.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84610053805.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/37143120001.pdfIn PDF document text
    • http://coumert.com/images/file/86494764324.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/gogixor.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/wifivapina.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/23841086347.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/66102648153.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/befakigo.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/45446376170.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/34130576803.pdfIn PDF document text
    • http://ed-union05.ru/files/file/rufulonikozokozu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ad667662cc19f05fd78eccc4f0f09a3a/vofonesisutuguzimigitima.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/zobur.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/texava.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/puvatinifugupujapadek.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/rometukebokudawatorugi.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/43238752134.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/79607408734.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 18612 bytes
SHA-256: 9af557219883c8d5057169d522050a8cd8eba4d145d8d58100d6d262650978ca
font_01_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 10416 bytes
SHA-256: 76ed9658c47514bbabdd33842d40ae88a3e03cf4f5c45064e944974cc44e29c1
font_02_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 17780 bytes
SHA-256: 661b0085ca6c359a57407c622b22e476c01538b30480a3f8580bc817d607cbdb
font_03_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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