Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e5299e54036907…

MALICIOUS

PDF

89.7 KB Created: 2021-09-23 04:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11f5da5f82349d724ebe7adf8d4da124 SHA-1: ab3fcef1bc0d35a1c0379a107bc2ce206ca2baa3 SHA-256: f8e5299e540369076aeeac524727aa3b6bf833d58c99d63a62d4bd01a0412d5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to potentially disposable domains, further indicates a phishing or malicious redirection attempt. The embedded JavaScript is likely responsible for initiating these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://regalmotors-jp.com/js/upload/files/61717104450.pdf In PDF document text
    • http://mobiliteit.nu/files/lofulep.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/78565088673.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/060315268704.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zupesenumuwujutuzifa.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/pedewi.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/92182846645.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/2979559915.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/70533156319.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/dojekapo.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/kipelujenoz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5fa9db92ac6d4b39018c64c7df4911e9/84667832169.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023ae08d9c---nofavisedesilowifofonid.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/76215066199.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/25934836018.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/bojesozoserovutebebabu.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/61689295456.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/jugazofatak.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wunomepalazujoxolatijaja.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/39036846409.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/6302806434.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/turuz.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/guminewugedujo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb0e5fad0---79065713561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ink+master+online+full+episodesPDF 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_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 16532 bytes
SHA-256: 91d4653fc8e9e02a97e30c0ec128b16f3c15e79c8510b538c57963695648e125
font_01_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 10804 bytes
SHA-256: 5f6a969c4d272e4df3bdc4108a4e65d0414385840ce095a7ba9ecbde3ada2ddb