Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab80d887936f50c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 17:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a90f4464d4471fb9404a2f5ab295ea54 SHA-1: 21ffdb160429450be851f97a26c130d7344f1cb0 SHA-256: 8ab80d887936f50c5c5f57caa52b555e5b7f366d82d13428d5a917bd284dc4f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. One notable URL is http://xn--j1aii.su/userfiles/file/fizano.pdf, which is part of a suspected link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://xn--j1aii.su/userfiles/file/fizano.pdf
    • http://iproperty.ae/userfiles/file/sinilesobusuvezori.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/fexako.pdf
    • https://sd-olimp.hr/files/4072870769.pdf
    • http://dotbamboo.com/file_media/file_image/file/fiduzinuxo.pdf
    • http://f-kcc.jp/user_data/userfiles/files/tixaxuwenamen.pdf
    • http://oasis-inwaste.asia/files/file/11228452980.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/82006628748.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/83827716577.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/28374844710.pdf
    • http://sonarkella.com/userfiles/file/dixurukexejibadadovasa.pdf
    • http://www.hebrewforreadingcomprehension.com/content/82590106884.pdf
    • https://gifarlcm.com/upfiles/editor/files/duxudo.pdf
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/tupuzifitotezo.pdf
    • http://seteo-dechets.com/images/file/sinix.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/16916334592.pdf
    • http://thietkewebbacninh.com/webroot/img/files/pimum.pdf
    • http://ahzgbh.news-read.com/upload/files/83216843110.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50eba1ac6---widibidilomezibitikofona.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/xowibesokuvog.pdf
    • https://nsaimmigration.com/userfiles/file/91499632367.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/mununigelogiviv.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/fexopujunu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stream+movies+online+free+no+registration
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 16792 bytes
font_01_sfnt_off0000c7c0.bin
559c1deac75f4a837e093ee43253682609521f059ed00be5ac0447948f58960b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 16684 bytes
font_02_sfnt_off0000f208.bin
6027429f8401306d20b299ff37a83f0a2fd8e1fb144b95b53fcd3524fe5c224e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 10700 bytes

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