Malicious PDF — malware analysis report

Static analysis result for SHA-256 1015412b4c0bdcb5…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 12:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12eccb0048b841f079557de8511ac22c SHA-1: e2d36d5ecf3df0500cf76da14f6e3d9f50367354 SHA-256: 1015412b4c0bdcb538b55e59c8cde3a9a11f40d4f4bc65d63aeedeed1a483a86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool often used to generate PDFs from web content, further supporting the idea that the PDF is a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=powerdirector+pro+apk+download+free PDF link annotation
    • http://jlm-kg.com/uploads/file/dofirobunejugijuferuxezo.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/vajujebigawe.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/natosidaporebukemi.pdfIn PDF document text
    • https://anfauglir.com/images/file/16036204130.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f48c9fc17---47365136472.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/923eec1187ccd6f5e0505263af27a839/53452626154.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/zapapovajujumarol.pdfIn PDF document text
    • https://rotitelor.com/contents/files/71696296462.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/10532348014.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/24219253190.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/71512286879.pdfIn PDF document text
    • https://alkoplast.rs/files/20982957781.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wosowiwasugamododagor.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/82679090068.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajakekakagifedad.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6135426b493f0.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/32839261998.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/91121658413.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lewaforetupujupoxewuzam.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jimexumonepixarukos.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/sikemiburepajuzeraxasil.pdfIn PDF document text
    • http://soupworld.de/upload/file/52275228091.pdfIn PDF document text
    • http://yejida.com/userfiles/file/nizego.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/16172326594.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/xifewugatef.pdfIn PDF document text
    • 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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 16176 bytes
SHA-256: 07a98c4c0a787e1b26f264f32cf728bc2afe87b458a0974a66e7be293c47af5d
font_02_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10624 bytes
SHA-256: 1aff9041587e5be68d1669fd13b003e60e366ed5e254bc7de74c466acde844fe

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