Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd11a50cc7768d0f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 05:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db9de181c494a2c2f7025fdaa67e6e46 SHA-1: 64e978396be70df76b9799526c1b71ad7b8fc205 SHA-256: dd11a50cc7768d0fb2f7d37c8c54b55d1f756a28ed21cedd265cb9c0a70638a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://inwebjor.ru/uplcv?utm_term=using+android+phone+as+webcam PDF link annotation
    • http://career-id.org/ckfinder/userfiles/files/2194770298.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/86770845222.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/bozovujopamo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d2ef366f---kafagoxi.pdfIn PDF document text
    • http://usagimatur.com/files/others/kiwojaz.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jegeli.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/wumudokuvitafevoban.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/lirajubojaxogili.pdfIn PDF document text
    • http://jucal.es/images/file/bofanotuvopotalajupizumax.pdfIn PDF document text
    • http://aurora-c.jp/files/files/78036575901.pdfIn PDF document text
    • https://adikmanis.com/contents/files/janatefetu.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/fitup.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/94828513506.pdfIn PDF document text
    • http://totoumi.jp/upload/file/pofiso.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/52717847959.pdfIn PDF document text
    • http://matras-devison.com/upload/file/18302044346.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/83241448372.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/sorigegimuvon.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91149715279.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/pozokewamini.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/43191325572.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/57467577213.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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 11052 bytes
SHA-256: 014c414091d4127b7990687f9cfeead1cd88341443d1ffaa2d233f3e1e8069ac
font_02_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 17620 bytes
SHA-256: 707dfa7f050f9e738037989235b7fa2591b4e1d3aac7006c023bc59dca3c2719

Open this report in the interactive analyzer, or submit your own file for analysis.