Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf9d2cdbba1fe85…

MALICIOUS

PDF

71.2 KB Created: 2021-10-10 15:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7995f5c07a2ba12a7800d36fedafab85 SHA-1: b7c3089d2012cf93771a91064728c04a30bcb473 SHA-256: cbf9d2cdbba1fe85f7be68f7ae5219aa7c5a9a9bf02f7e040bb5cb74e3135c65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicative of a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a deliberate attempt to obscure malicious links within a large number of seemingly unrelated URLs. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://malir-naterac.info/UserFiles/File/1085931532.pdf In PDF document text
    • https://umartravel.com/files/javifonepotafigapam.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/janiwan.pdfPDF link annotation
    • https://foulardfotografando.it/file/tixena.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/segevupobugawif.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/67627331937.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/7407752303.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/rorulevo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eec0c86498---mezojivawaxiseba.pdfIn PDF document text
    • http://trevorhannant.com/vularexibewukoxunuwerufa.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/wibomez.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/pijadej.pdfIn PDF document text
    • https://kawanmto.info/contents/files/63416497473.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/selaroda.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/83541850484.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/revajevafidasaleduwirivaz.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/64077339379.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94050806518.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/18779414204.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/96637623736.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/vokusosojogenixolo.pdfIn PDF document text
    • http://xenangheli.vn/public/files/pazupasobipolaboxopadada.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161509e11e0a7c---95161213601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+last+of+us+manualPDF 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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 10352 bytes
SHA-256: 5921292d5f9f1b47e700a7ddbe0518545b94bdfa2a862f2d37a655400324fd5b
font_02_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 16328 bytes
SHA-256: d6b1690eba3d99c387e6ac9d080b7dd06769febee7a324059c3e2df623825593