Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff6ad5f50f07bbc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 12:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 097746ba20f9832ddbd7d6545231647e SHA-1: dd69dacb684dacda7249f07ddc1215c3e5c2daa1 SHA-256: bff6ad5f50f07bbc6249f2f8b0591253ee1703a3308124560200b227ecebae60
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, specifically phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=connecting+ps4+controller+to+android PDF link annotation
    • http://gunjanjain.com/app/webroot/js/uploads/files/marejifed.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d599bd81---davupuzuf.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/nikojiderufuwopovoro.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/51849042019.pdfIn PDF document text
    • http://ranch.pl/files/file/vefuwonamewigakosusupun.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/71709967015.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/36690171682.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/66615539002.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/deruno.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/kelusepewuvegata.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/gudobepagaxifezo.pdfIn PDF document text
    • https://askisan.daynexdemo.tk/upload/files/72930788840.pdfIn PDF document text
    • http://www.ezmoving.com/file/83180045584.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/75928752300.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/buxila.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/73692792790.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/gidifusu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zanivo.pdfIn PDF document text
    • http://jiab.net/userData/board/file/8231235440.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210912103607.pdfIn PDF document text
    • http://hanifeugur.com/image/files/36055051828.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/welexas.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/wupoduduwinatomebegit.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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 17084 bytes
SHA-256: 73a796e7bc684d524ce6c338250be3d61fa2fba711e0e28dc77c87401468bac9
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 10796 bytes
SHA-256: af3f4e40b73255f8ad0b829539cc6cc1bf5dfb02d79e790537f976e1f180e025
font_02_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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