Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecb3894e87ffac6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-23 01:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78cc5fb3277e592391f2a282ae16fb50 SHA-1: c8dcb2ceb9aa8a9f53021435332046768fd9cc57 SHA-256: cecb3894e87ffac6d27a10c5669909d1e8fa519b204bf5481724c6392b8020f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, suggesting the PDF is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=video+editing+software+for+mobile+without+watermark PDF link annotation
    • http://hansungid.com/userfiles/file/77569747727.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/76938925240.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82bbcc4a7---ledogagejizonutogup.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140d1e5c07d5---92142421728.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/bazuzufimogubet.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/5621800242.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/21857683222.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/tipugasepegivowewariw.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/51109377014.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/26337615315.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/95341818825.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/87624227452.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/tegub.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/8830117112.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/solefiroku.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/59726874170.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/40166304093.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/sewibapowudorexok.pdfIn PDF document text
    • https://stopserv.ru/files/file/rezidazazinarisemati.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/makixibefozuken.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/zuwososezolenaxox.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/vuvurevitolixunopuwekim.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/xabenukoleluzola.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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 17540 bytes
SHA-256: 8ed2466617ce2cd52299599814888561a17108ece8ae3ca205d792f3b25e065b
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 11188 bytes
SHA-256: ec068fb010c60b6fc89a6da8730c0f5424a3cfa7bd942bad004fbd5395dab53f
font_02_sfnt_off000138a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1