Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa96bcccd5b0721…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 06:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87461074ad8c8c69cb89564894e3d78f SHA-1: 016b0fe7aec4d9e8092594dbbeaa5a54b39716e7 SHA-256: daa96bcccd5b072163991c82a0bf37d8c71cbee89b144be8d48feb3f99d0e50d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=city+racing+3d+mod+apk+unlimited+diamond PDF link annotation
    • http://christmaslandint.com/userfiles/kapadunorixatofumi.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/darozoxizorawa.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wunot.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/66072194141.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/8204410436.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/59699667854.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/fadawigabuwijitasezajub.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/jaxopovifamemadekavavim.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/15157531500.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf6f43406---47615998825.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/10253408969.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xifedewigujideliro.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/talisodavotufedozopuzijig.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/50818703416.pdfIn PDF document text
    • http://soupworld.de/upload/file/pumozobedu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/pajoz.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/47083215077.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/36809169913.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/37261398610.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/sazijujalukufilepa.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/makase.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/kekopo.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zafawesexibezesosu.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210901_060955.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/66812427402.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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 17280 bytes
SHA-256: 36dc74c4612425e3d2b01581993980c9d532bdad2db63a81cd04242ebc652a82
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 11200 bytes
SHA-256: 189560f5401d2d0d4a4958cfdc587359b51a894e00e186f51695de12cc9e6fd0