Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fd9f4bc2721eee…

MALICIOUS

PDF

90.5 KB Created: 2021-09-18 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a9f35f35cac1b62b4f121dd59eece41 SHA-1: d731cb5c22dd924d30b4a4405cee9286eaddc838 SHA-256: e5fd9f4bc2721eeeaf137e3f72488c71394f88b07cddd58a8fddccca83d2ef05
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 document also features a large number of external links, many pointing to disposable domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest 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://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/zanarujib.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qsq4k6j5ii2sf49mj2paq3s8k8/72104435608.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/4472247228.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/degudisebevesagovud.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/95608527112.pdfIn PDF document text
    • http://csp.hu/editor_up/gigutozimorovo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/14749323129.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/lujulapizonixugimi.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/73063679491.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b06e3efc---60860717160.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/48743707847.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/15154494828.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/90512512903.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/mefakavuvozakabolu.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/92569263664.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wedojixariloridemopimir.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/89815797802.pdfIn PDF document text
    • https://tpk-m.ru/files/file/63619998863.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/67321757059.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631443626666667927.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/ximir.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/16873942872.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lajivijekop.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/nipamewazumerisegasoj.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/sogex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=putlocker+gemini+manPDF 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_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10600 bytes
SHA-256: eb7b82b9ecb63b1d5b5dcf41cc389ea0f681821d13d0a9789d3f46e710494d9c
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 18784 bytes
SHA-256: b9733da88a152b2eecfcdab970371e8982b16ebba86785fc4f28c32082685436
font_02_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1