Malicious PDF — malware analysis report

Static analysis result for SHA-256 7723ebdc0ddb292c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 04:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 325bbb632810f02e603019bb2f8dc1cf SHA-1: cbbf7d8a1e0a89d163ed2ce135075778c50fa97b SHA-256: 7723ebdc0ddb292c09df836d9312f69705471d0c89f0f53c461f143930ff0694
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9980bf0ac---29927122847.pdf In PDF document text
    • http://hasicimosnov.cz/foto/Image/file/59669257604.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dipekuvibekazo.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/saboguterejewewo.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-1/20210901152213678253.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/zimedexaxoginurisoboru.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/31748294367.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21e700420---satupitakunutevo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/ratukugugupevejavi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/83015980673.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/roxusena.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/12456128344.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pigokije.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614079b222e3d---jipixamemaked.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/1150535230.pdfIn PDF document text
    • https://gdaniec.com/upload/files/jovis.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/kilabemoxowemomapev.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/33006534264.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/64599163692.pdfIn PDF document text
    • http://esistore.be/userfiles/file/didagedopedopa.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/38919029710.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dosepadiv.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/zujinig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dagger+unit+testPDF 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_off0000b504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB504 10220 bytes
SHA-256: ecc057beb4c270270e006c2778b2a11f0755fc586ec02ca02e4a0eb747f1292f
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 15972 bytes
SHA-256: f04431d4ae14c43bb2ab77bd53a618af9633dc8743536b5ac187d72df2820485
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1