Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2848bd947d8a16…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 09:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: caf8e0c05f84e8a6f2ad20345a7eb4f4 SHA-1: 1686e4633ea97194b2e0af26c63b94c06dc8a9b6 SHA-256: 0a2848bd947d8a1620a99b39b30ee2cac0d88c95e48579f038ef788a7a97be26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a high number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=instalar+temas+android PDF link annotation
    • https://doublehair.center/upload/ckfinder/files/84054125878.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/38841998584.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/dewerululokesogafem.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/57634647613.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/fefijufimop.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/tinajin.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/47335961480.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/zowasu.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/16808166250.pdfIn PDF document text
    • http://wixoon.hu/upload/file/63790063483.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/kinebefolenubepevojudev.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wesesituwixila.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/46591356215.pdfIn PDF document text
    • http://torgoborud.org/images/file/wubetekagi.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/zukuvivosevuzuz.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210926134319790522.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/zijubi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/18846544732.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/97053235360.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/70642339350.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/gometano.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/kawibu.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/36795811585.pdfIn PDF document text
    • http://feg.vn/uploads/files/76082350650.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_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 18328 bytes
SHA-256: ff99a7c16acf18f3beea122a4f9235ce1fb2d9551e79d58d7bec38c37fa805d7
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10360 bytes
SHA-256: a5249ce72052229ceb818ffcd24257c84e5fa47c66966388a224884601e90a09