Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a3ecf5604e58ad…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 06:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be6878cd59bb4ac4260ffe8082aa5dac SHA-1: c3bce82fadc79df90eb387d523213bcc8d2da994 SHA-256: 18a3ecf5604e58ad19c4d04faec9121a481cfbb05c0ad6339a7dfd96c7f746dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mudrberanova.cz/userfiles/file/40325247706.pdf In PDF document text
    • http://abwclayton.com/uploads/files/doxivikofufofom.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73608782973.pdfIn PDF document text
    • http://unseretochter.ch/images/file/3092685735.pdfIn PDF document text
    • http://safetruck.gr/images/file/91962454112.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/3194201802.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/11897160774.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3v5me42kn25jvh3tlmt95hfmi0/burominumupoj.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/votufebezisimulule.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/19489555924.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/peginuripanaforitu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c928acfe5---xulek.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/5425978027.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/83896616759.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/mulabetij.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/3884830312.pdfIn PDF document text
    • http://beta-rc.com/upload/files/mikegudewamom.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vazaxexewiwuliku.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/81827663121.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/polexovekosezobi.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/74287555519.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/kugoxevatofosovinide.pdfIn PDF document text
    • http://gibisch.biz/files/files/88152341500.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/81670832600.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/dalajapaxibaluda.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/66489620865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=quickshortcut+apk+free+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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 18256 bytes
SHA-256: f78d7d40c9e441d1aef1db8ed23e8bb1fe6cefa4a5534defb673e89d2521c2da
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 11056 bytes
SHA-256: 7e6351b83b31fd9f03b362742853d5527a07e7af39387af54a62c115ba165ac4
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1