Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a9d794179971b9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 13:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b4808710b0bec26bf12801433d93325 SHA-1: f3f7732d83aadea86856b05ab6b31f1b696d9e48 SHA-256: 19a9d794179971b9e8fffea8bb38c3321f44e7b88eaf42d46e57d34ce32fdb12
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to PDF files hosted on disposable domains. One heuristic specifically identifies the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates potential for malicious code execution, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/43804321194.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/61726413189.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-08/44453a81d83add8a9d6653d04df11742.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/42335449547.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/3762731862.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/nodamorokomadov.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/winasiwawerotaweguvi.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908192242816674.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/vaxaliritadivamutataj.pdfIn PDF document text
    • https://okazionche.com/files/29634676629.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109052328413877.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210910065035.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/72675182815.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/58751009918.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313e516c42---11203076730.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/midipudibuzofafukis.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/56933824439.pdfIn PDF document text
    • http://djpress.pl/Image/files/61278166188.pdfIn PDF document text
    • http://mopron.ru/upload/files/47320743925.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nudufufuwufoju.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e052378d84---81987644074.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/wozoxawilinejipodigebew.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/27194105956.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/sexurajejodikepig.pdfIn PDF document text
    • http://15881588.com/ckupload/files/nulowogifugidibojodevubo.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/ralegosabawudikajagefoka.pdfIn PDF document text
    • https://festacontinua.it/public/file/nobupurivavaxagum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=whatsapp+new+version+download+apkPDF 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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 17984 bytes
SHA-256: 4b6002d8842e03776e05ce7f1d4267c275876a3c1cd74ea05bf30bf03e388998
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 10728 bytes
SHA-256: 244772caf30bf2dd7610a04d27574454101b4b43c2b8b7f97e3e3148f60391ef
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1