Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cd316ac775adc4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-12 06:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04485b9a155ffa686ac1d4b55e066434 SHA-1: 28fbd5d44b6273f18b83d437065b2def0837e8de SHA-256: 75cd316ac775adc4e58910b89020d4df01f46fad26b44efe47e41090da147a56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high number of external links, many pointing to disposable domains, suggests a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://lejonhund.com/upload/64805429318.pdf In PDF document text
    • https://tidaksusah.com/contents/files/gawipulezavimutetamedopu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613970224193d---xofesupezilemunikoxam.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-11/20210911064150537541.pdfIn PDF document text
    • https://claudiodituri.it/uploads/2737044544.pdfIn PDF document text
    • http://c-six.it/userfiles/files/8835176889.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/durunozumujiga.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/68550389837.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/tosozufivetirujisamewafaj.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/47404390315.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/57454510262.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44875364532.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/20642498101.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/buputivejamisujawasidali.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/watujajezagutemutamidaf.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/33949472037.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/fobefodi.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/7957060026.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/zexelewutijireramiwixi.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/datipewuxozob.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/duxabavilakipubu.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/nipeluwasutedevokevanub.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/xupovanopugokixesuwom.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/25427403581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=descendants+1+full+movie+watch+onlinePDF 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_off0000bd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 16912 bytes
SHA-256: e7a2207201619a75f2f4fafed8d898b9ff466d744873b0c53a730b497f7edef2
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10948 bytes
SHA-256: cdd43df54bf45028ddf83aa4eb551b78f24836ee871be632f0fb0893b8300ad5