Malicious PDF — malware analysis report

Static analysis result for SHA-256 6599de49d4da3434…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 17:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd956760ac25196fb68b84202972c407 SHA-1: 5982ce0d5db341a2f033c2d350c33f201edbd1ed SHA-256: 6599de49d4da343469b02376b2e077272ab9ce7732fcc01204e291e252229b85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=top+10+android+blogs PDF link annotation
    • http://ashokarefrigeration.com/userfiles/file/nelitafi.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210907113101.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pakopojet.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/65579614262.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/81431391939.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/xutenep.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109162228206422.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210906140547.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/27373024057.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tesufemixipebewel.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/36196015428.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xozirajiweburuxisovusolo.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/65645911255.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/zamafetowumix.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/zowuketositipajozelozod.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xogubatot.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91311535808.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/ludusegazolesavepavanem.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/96095122887.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nekopakumilumujep.pdfIn PDF document text
    • https://laser123.com/geektic/files/kepagemotoxapoxo.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/naxakujoxi.pdfIn PDF document text
    • http://www.centralperdana.com/file/49566820200.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/58c071c62a267bb2a9e75d184e7ed682/47588623598.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/74956246503.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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 10616 bytes
SHA-256: 6d5d9adcda6029d8334bd0dad9df14bb557577cb133271adccdc79b5bdd3e320
font_01_sfnt_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 16256 bytes
SHA-256: 0c2d00d776dfb3224d0c3af527d64ddc88b41870e9d96e128f53fc3b537fab7f

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