Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5f2ca8a6895d14…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 06:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5b66df25cf070c0e9cfbe5f51ff1fc5 SHA-1: 71c0ea0e2b80b52cad6a92ac2ac7deda99cbf338 SHA-256: fb5f2ca8a6895d142cd3b676c5317fee576a66fe6a04d2a8a9e6255f52258691
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/mudizovojeritujofo.pdf In PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/27735930507.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/46548596425.pdfIn PDF document text
    • http://dongphat.net/upload/files/73950516900.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/66121051904.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/dufazu.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/49808063108.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d55ea8b5d4---zesid.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/vigobutarekaras.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/95948547825.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/lawazomep.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/detimuxadaximozu.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/89039077655.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/7825641492.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/56973488173.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/34652780745.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/69875685752.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/datexurig.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/40770300350.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/90349164731.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lanaziz.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/luzagulabalemadasibo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21c13fa14---93314236756.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902060015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=use+android+phone+as+tv+remotePDF 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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 16636 bytes
SHA-256: 3bfad5ca82e9402d669c7dcefb55dec55acda9fa5572b0cae2cafe043ab7ff24
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 10684 bytes
SHA-256: fb769c6d6e3f836eaf6dfbba7d656c27d91b53af2cdaae446a4e8e3c8fce51d5