Malicious PDF — malware analysis report

Static analysis result for SHA-256 6769da3966fb93ac…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 06:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dbef3c9623415321a6c0418f27d1844 SHA-1: 3a4d367c63a03edb7ec9ace00e493f73abd82fd6 SHA-256: 6769da3966fb93ac5f2e5c1801357ef5d12eb65a3725b3537373ca9a61daf11c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pierrelemagicien.com/userfiles/file/54944558748.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341bb38a4---puretenupiwas.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kujuxogulagotin.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/kafisujexuxoziwawa.pdfIn PDF document text
    • https://31app.com/userfiles/file/27387340538.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/1874400701.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/63831486213.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/31041577217.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/74444987117.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/84362233933.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c2a85bf7---26107091320.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/vozolozaxisipolewokugixis.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/87417369272.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/24334139611.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/31982625274.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/91139924983.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/12672459873.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/55523290616.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/vorozulirujixa.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/25825657945.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/pavexamate.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/fimafat.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/56117604877.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613839f7741f5---kesomole.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/16221484549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dahua+dvr+app+androidPDF 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 10212 bytes
SHA-256: 74df3d8bb9d35bef1ad46cd13c6acc634500cae1e671a655031d1ed0ccaee9c9
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 17536 bytes
SHA-256: 24c8320e71830ab2b07e2052cc76666b679086d4ca70b6b22619408afa0e6f87