Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfe4a083161da92…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bd781aa532644740838c860c1e9f94a SHA-1: d188d5fc3b01084149601a6e1aa17907c1896ae1 SHA-256: cbfe4a083161da92dfea49fd71613d8c842ebe17aa3a35818946124ea63629c3
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 within documents. The sample also exhibits characteristics of a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. This suggests an attempt to distribute malware or conduct phishing operations by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tongrentangthai.com/UserFiles/file/45114501250.pdf In PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nowozadobaze.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/35477680144.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/97348705550.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wufag.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/65594832516.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/nilativanuxipapotumolev.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/16103882576.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tevopunepisaf.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/zujesiralatoraren.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/74225248421.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a0da0d12---24472950150.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/10151265196.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/37144795233.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109130645079598.pdfIn PDF document text
    • https://noventa.cz/media/files/file/rorinexenatafugu.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/venanaroveworirigu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/79030280853.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/poravelapax.pdfIn PDF document text
    • http://gapp.fr/medias/files/48766249532.pdfIn PDF document text
    • http://polletnv.be/uploads/files/bidapeta.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/77438222792.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/buzukabizorowatis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=yu+gi+oh+gx+duel+academy+rom+downloadPDF 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16220 bytes
SHA-256: 111b674f4335b3921892d83a23edd4a29add2ca330ec7af362d1f2b1101d530f
font_01_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 10936 bytes
SHA-256: c46d70f4f16e4ec8210a464f235ae0e72a98af33ba7d0815c67fb4f91b4ecc86
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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