Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0970fc3cca8d995…

MALICIOUS

PDF

92.2 KB Created: 2021-09-12 05:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2628b0314fa01171d9909aa7c15fc0e SHA-1: 0abec8fa569abfbd69a09f68304441661783a204 SHA-256: f0970fc3cca8d995f3ef02f31cdc80b799858c4bdaa561347d79e29a5dfc76d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URLs, many hosted on seemingly unrelated domains, suggests a link farm or redirection mechanism intended to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kes.org/upload/editor/files/39662315587.pdf In PDF document text
    • http://skonasystems.com/userfiles/file/zosalenebaf.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/67408501592.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/28848398376.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/zugagukuzugilagoru.pdfIn PDF document text
    • http://livestocktool.com/d/files/57902778569.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/gigobovuje.pdfIn PDF document text
    • http://snsi.jp/image/news_file/mosel.pdfIn PDF document text
    • https://actor-conseil.com/files/file/65078150694.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902130814610.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/kufanevukezopoxiwadoxer.pdfIn PDF document text
    • https://lazerom.pro/media/file/mufaxudatidejojug.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/fozujodeb.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec87b922---norix.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/rujitolinemuzakano.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/56eb49eeb7660ac7f175af9cb503bf4d/gaxigefisekewilibavodoz.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/likijuxepazunebaw.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/masupar.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/74105617967.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/mebaganutelopa.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/75851671648.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/82427956178.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/96650967122.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/26482840793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ashes+cricket+apk+download+for+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_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 18108 bytes
SHA-256: 88a1a3e4ab5f3138b40e7ac40131bc6387ddbb9eb55cf49e8a161e39b2189748
font_01_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 10876 bytes
SHA-256: ec3266fdcf93b95d3408975fa8eacbce04a5e47bcecea8dfc403db2d8d826aac