Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7476e6a33c46dd3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 23:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c189cdd23688c1a7f73de0a319863369 SHA-1: f3f1e80c25013ed499b3525b7c4470a8d40911b6 SHA-256: c7476e6a33c46dd3707a7a1a3e67bd499742dd47d0adf9ccd185764068d62f06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous links to disposable domains and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gloria-eurex.com/images/blog/file/fizoxu.pdf In PDF document text
    • http://upasamed.org/Content/uploads/files/fatubojupu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/19896796053.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/84722167620.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/24891366569.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a578831f4---rilukomosufemajeke.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/ramiminegoro.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c5023286---jewuwidajaxuser.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/82565071008.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/raxowinudu.pdfIn PDF document text
    • https://majubesar.org/contents/files/87658457523.pdfIn PDF document text
    • https://tigaintan.com/contents/files/40439945400.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/19531260867.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/barupitewalirowabufotir.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dirivotamisodabi.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/koragezutometasad.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/88756997429.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/19946462465.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/79192336994.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/43525469404.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/xunotiz.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/penar.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/83210977953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=generator+skins+fortnitePDF 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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 10292 bytes
SHA-256: a649e0dacf8c5f9a76cfa4efb07853c1859af9a0d73ccd5dfa9362ebfa39ea1b
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 18912 bytes
SHA-256: 766ae7cbc315856f29467a92bb0b72e7dec32f3fc6f9d7d781bf1a5c122415e5