Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b64e2e82be61185…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 04:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ca6942879f2f1d97cdec35d85a68944 SHA-1: d5a0f1011ca2da3dea70936cf84b82706c94b897 SHA-256: 3b64e2e82be61185adb8adf1caed87411c1059ec317445441672ddf2f5b0dc7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the file is part of a link farm designed to distribute content, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely attempts to redirect the user to one of the numerous external URLs found in the document, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/83183b54fd336f3289e54ec723270bf5/47902412571.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ff75b85704f77816e3fa05cba3897b0b/68970743616.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/55422924667.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/60132579609.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/fukavexuvofegupemewukekuz.pdfIn PDF document text
    • https://faceless.me/userfiles/files/momifuravizonib.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/fukimino.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/72944553995.pdfIn PDF document text
    • http://k1a.ru/images/files/file/vatuvikilizevupe.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/96733168482.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/20447294992.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/vumogazofopapuximonudaleb.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/jiwul.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/wasidutorumamedi.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/jitoxo.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/dezisemuvitebipamovud.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/gikubosomomawuxunob.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/97701247625.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/89788878360.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/18887995885.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sizufejoxovagibidu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210903040501.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/kokepatit.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/82242394284.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82438400797.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/puzogurodinasatofitileseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+hobbit+free+pdf+downloadPDF 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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 10616 bytes
SHA-256: 6e054d2f48177b85d65fdd9687429e7dfe460e26ec54415195591cb7da862cf1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 17876 bytes
SHA-256: cf07fb3b2a3fc919c89c731af1ee424bf1e798994b391f5749f17798056e908e