Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee23da2a709d54d8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 21:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90d94b993be69115e36d7658f33cc27e SHA-1: 2035ce56152f6fe01d8b08e34963e3aa227ebfc2 SHA-256: ee23da2a709d54d83b682edcafcb0706f5616f0cfac84e0552d92a34af5e72f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, many pointing to unknown or potentially suspicious domains. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

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 https://swapnauraan.com/ckfinder/userfiles/files/zifigodizeta.pdf In PDF document text
    • http://recuva.kr/upload/fck_img/1631757188/file/zinulejogujiv.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/69263309464.pdfIn PDF document text
    • https://emenu.hu/editor_up/tixire.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210911084248.pdfIn PDF document text
    • http://lscapital.it/images/file/gunirasituro.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/91990597252.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mejapanaruxuma.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/gelodivo.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/52472023248.pdfIn PDF document text
    • http://strahyi.ru/images/file/lujirunovedozutifakajova.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/94000130730.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/9530706221.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/54102922385.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/13390614742.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/32487481629.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/60904323235.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/toxinesinomut.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/92a4856b4142ecc7b8b9fd41de771027/52632233255.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/medijirulojejesuzu.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/pirox.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091611020988.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/76962410430.pdfIn PDF document text
    • http://safetruck.gr/images/file/zoxiz.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/58942540174.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/31663481723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=logistical+and+ethical+considerations+in+researchPDF 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_off0000b2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 14596 bytes
SHA-256: d2b855dc21d0634d0d19e5f336222295eccc2f6d264341e6389a5c971f62d170
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 10608 bytes
SHA-256: bcbc454bd21e9a224f894c8e47ed657e104dc04d189ba272f4fcef9535db1ddb