Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8550914bf91e879…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 07:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2a02c43fc9488c1f3661677fdf43dbd SHA-1: fd1a335b890abd5f5cf5732506b189e3e4a501ba SHA-256: b8550914bf91e879e8e36cb8f3b9d50989aacc887f08fc8afd1887ff64abba7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zapatosperezcabrera.com/ckfinder/userfiles/files/diramim.pdf In PDF document text
    • https://daks-96.com/f/uploads/files/pafonazilakaposojeduj.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/jelatoxuzevub.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/liwedefavogob.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/99067209165.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/66894175211.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mosetegojezowevaxaruka.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_13_23_06_8127.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/650637698613be43dcbb2b.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/4923071191.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/52023577690.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/gowosijozavugu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4f1b25ee---14842127703.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/jufamijirivojid.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wonaba.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/kuzodopuvijetagog.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/sejazafuneg.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/28248072713.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/dekotoloziravulibuzad.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f5b60c56---4886429358.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/93718146569.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/57328643948.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/xubigafasijuj.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/92407690619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+scan+qr+code+on+phone+screen+iphonePDF 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_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 10788 bytes
SHA-256: e4786ab1853755c0b5f28f61318a7c3ed88c25532934ce5dc116a4283a3a3f13
font_02_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 17588 bytes
SHA-256: 6286e0d746cbe7f54e3018acbebd2d6f544230aee750bdd702b885eda9efb5cc