Malicious PDF — malware analysis report

Static analysis result for SHA-256 679c5894291d64d5…

MALICIOUS

PDF

67.9 KB Created: 2021-09-21 09:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c4f3d442136b8b6f397a98242079a91 SHA-1: 2b96029692aaab9aa7d44b97c13d90a9ce7297d1 SHA-256: 679c5894291d64d5bb6027c8c3e0d82e4f2c5089e1062f1d26b450ba574a7cdf
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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.
  • 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
  • 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://aescantabria.es/upload/fckeditor/file///pixawopol.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/63262980098.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/vorijemadabeze.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912124444.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/36903909141.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/27503680568.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mofabuka.pdfIn PDF document text
    • http://gro-felix.si/uploads/ruwubositizoluzud.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ximibalijo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/54905222628.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/61784021625.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148532fdf6f8---34224743654.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/divuboje.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/42252244535.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/pimuxita.pdfIn PDF document text
    • https://labelmarket.pl/data/file/85188313068.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/55516701076.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/72048551278.pdfIn PDF document text
    • http://apex-architect.ru/images/file/31629393595.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rivamuxirowururazelod.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a81aed585ce91bd6ce7217faab8a941c/gogasofaket.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/vivulowaw.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/9548399382.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/63954316745.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/50823422041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+the+vertex+of+a+graph+of+a+functionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEED 17032 bytes
SHA-256: 982fc3e738351e5d6f7827ae494b41b01b99b33e3f7a2f563b1a3e3e2aca3e9a
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1