Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ecb4e4c9e2894…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 09:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d559e93142451a9fb0d4c960b9b8afee SHA-1: c3142490c0241972d7fd60faceb20bbdd675a886 SHA-256: d88ecb4e4c9e28946231c4cc2bd86030c5ce7c15f094a4b6682bbe4e1b130368
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 links, many pointing to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://lingchuanfloor.com/app/webroot/userfiles/files/wenino.pdf In PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/tojazedalazunefejekakobi.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210909180501.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/78868844396.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd42dd9a9---wajisoliveretixedubemod.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/viloxuvilo.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/46377534902.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_508E9C209AABC08C.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/bezoxa.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/degijegonugiso.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109070833059244.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/dazerivozogo.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/lamojikupomutowebix.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/44840122849.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/11853036286.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/50152460419.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/12697107781.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/85539206582.pdfIn PDF document text
    • https://kildevangen.dk/files/ligonoxigiv.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/zeraroxifuzetofisokazakaz.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/91338414251.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/sotenoj.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nolakiboreto.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/8178867880.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/sumufoledoparakeni.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/javakadusiputod.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/ferotazetazubipodeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=empty+voicemail+androidPDF 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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 17860 bytes
SHA-256: a2712338aa5a9d5a0adc17588d28a5f4998d1aa183461fabbb1e74eab70573b8
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 10668 bytes
SHA-256: c0200fcb6e1639e168e84f2b1d251c34f32907d3c5a0ee101aa474486d3b07ac