Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ed9572f5e541f8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 13:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ddf8840f09e96286e6847fda5fc8ca03 SHA-1: 3d778e8184278b3cfc10c5a202222681e2f306ac SHA-256: 04ed9572f5e541f8fcce3fdcfc82ffb2e87553abc7d842be460c30b0ad132924
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=new+android+emulator+2020 PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c15ul383ervamfea19hb1048pg/64112107838.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109062217532178.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/xazonineperedofaroxorot.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/18024860163.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109140603112241.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/nimomoselalefosozapiborov.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/68024089290.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/60935193083.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/nizanarofa.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/7499649377.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/makomevotuwuwurakafagor.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/kebuzuzo.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/bibalasabulejumirov.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/58648415464.pdfIn PDF document text
    • http://ch-yang.com/upload/files/pemudenaloxozinunikegenoj.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/33504448217.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/500891422.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614741b941d42---bavupolom.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/golawenusasegufujanij.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/19807737886.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/51915692336.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/wimovurosedapivapadikuv.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/momafofavisifavesuzo.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/lazuvokajuna.pdfIn PDF document text
    • 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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16836 bytes
SHA-256: b9eb35558d55a29099143e0a44ef6b148ad6447fab63188ffe2efc604986fee8
font_01_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 10644 bytes
SHA-256: c8836ee444e7e69fe760159058f59d02301be2087dcc1398f3f814708a0bc22d
font_02_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1