Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4b02690db1148…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 14:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb233c863dbb62a6bc2da85383f0bbf9 SHA-1: 9bf80c8c105582e85170519f1b0d15a84f5b9fd6 SHA-256: 2db4b02690db11487e719dbe342e1ba46de91b1439e7d15332520e9bca2ac205
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites or for SEO manipulation. The primary IOC is the link farm URL, and a secondary IOC is a Google feedproxy URL that was also present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://stagelight.pl/userfiles/files/vijisedatamakuto.pdf In PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/9141506579.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buzaxabelumuwojolalureba.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/11498181453.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lozexobakanabuwosoxim.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/9446651160.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/44719149223.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/govozobeduvowojitadelute.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/2296413058.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kilesulu.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/2012410390.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/sugirunagewogifupuzaxagu.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/pelunojop.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/76058240505.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9c2df110---59252755545.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/46499526215.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/1887588384.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/xebawemozis.pdfIn PDF document text
    • http://envigest.cz/upload/file/zufovafuloditodokuzusoret.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210911042436.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16318098291732229615.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/15330646697.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/17764005073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+iptv+player+for+android+boxPDF 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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 17592 bytes
SHA-256: 832ab7b8e1d394a86a50e30719e48a2f9cd95d58bb87ff33c765016510ffa47b
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10964 bytes
SHA-256: 25846e606d684f856960471ae86ec77e42a7d690ce6db48209760dac75c6acf7
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1