Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ec7e692a699d1…

MALICIOUS

PDF

77.8 KB Created: 2021-10-05 13:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d2c13133c477f286e8a55f6c8c579f0f SHA-1: f76591579cd32dd0046377955ac48717141b1e90 SHA-256: cb5ec7e692a699d16a145a175300d3b53781cbb403762ada7a2901032b3154d7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating maliciousness. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business email compromise (BEC) or phishing attempt related to financial transactions. The embedded JavaScript likely facilitates the redirection to a malicious payload or phishing page, and the numerous unknown URLs indicate a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://3e3i.com/UserFiles/file///47551198370.pdf In PDF document text
    • http://detaycopymatbaa.com/userfiles/file/2565556743.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109301555187774.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/fujoteg.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/45024777894.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/50135274457.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38724792431.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/10871752074.pdfIn PDF document text
    • https://gdaniec.com/upload/files/ziwadolux.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/25949391201.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/nitusomikegi.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/jozobotevadizof.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/jujisikexapapetomedi.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/xaroxemuzes.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/puwel.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/jufopefasesogoxodalawevi.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wajegepofi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/dogevedonifebuwoze.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/89723777883.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/sodifovuwafa.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/5955455584.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/wizopevobesepim.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/fojitefo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pizesirulofilejowozap.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/rezexagebutokudolej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+turn+off+screen+time+with+passcodePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 11016 bytes
SHA-256: 7103cda65e1de2425e3ea6f6568143117442a75d886df48274e275058b4f9c22
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 17240 bytes
SHA-256: 67ed5f17812fee75bca6289a338f9293fa7789af30832205e5b7ab95cf6a542a
font_02_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1