Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d707bbb279436a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 21:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13dae681e16bd0d315c4083783d33355 SHA-1: ef00bf2bf204cd443b6b9f783e4600749ca7db9c SHA-256: c7d707bbb279436a44b4dd9bd1c5d400308139783fd010e08842f65a3e70644d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on different domains, suggesting a coordinated effort to distribute content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or SEO-based malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://dralituncer.com/userfiles/file/tigevabuxavoputozazimi.pdf In PDF document text
    • http://apicn.net/upload/files/muwutewuv.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa592f6a6---remofopuramibodupu.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/73426049435.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/kawepajetotet.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/nivakezivuvawewifuko.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/tijumebasododejili.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/ripoxipixujigag.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/25665977268.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/95226469901.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/99499969097.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/63847184638.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/77182016244.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/7930989628.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xokukevij.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/sotajoniwax.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/97602367146.pdfIn PDF document text
    • http://jsdarvin.com/files/jetigodokapadodupafa.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/rovobomusukesaxu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/11sgkoc3v3en6df2p7ltvodu67/lukixavijede.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/wowurilewu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/darakagejebusur.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/zetotewanatimito.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/renovepawimogiwolofagudak.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/wunutitonamufuponot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=most+bought+fortnite+skinPDF 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_off0000b9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EC 15560 bytes
SHA-256: 1af1d6536165cb17caf83f2ee919b0dea874586d38d27e8862327624b42ee4c1
font_01_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 10612 bytes
SHA-256: 4470d2ecee11f78eca9f13dfc46d18915b57dfeb3887be56059f90198fd0f720
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1