Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d23261b5ad02f25…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 20:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03cf08c50f2c5bf15fec4a38bcb880b7 SHA-1: acb804607f3db2e6e1f9160b7c0d201b1a2cd2c9 SHA-256: 9d23261b5ad02f259e915e6425caf7c995738297827da97e8cf8082804de6377
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous external URIs, many hosted on potentially disposable domains, suggesting a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://lawfirm.vn/MINH/user_files/file/lesag.pdf In PDF document text
    • https://watertorens.nl/userfiles/file/sojafisovedevu.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/48776926974.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/20520816405.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/xisuwegefigapumivodax.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/17563749345.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vuzozetamugiroxetisi.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021910212492575.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/53313853041.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631447303.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/71705896953.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/52100653568.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/bozikabazerozef.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/ditilurovasiti.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/38157928612.pdfIn PDF document text
    • http://byecook.com/ckupload/files/37101195745.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/besupefu.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/22625511037.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lk39a2jjqs0ebqkrqkuv3vb5pl/68542666051.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/2489899888.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/fosobazokebujirixizotu.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/numuraw.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/37543617986.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ddb41104fb7872ef2002b9cca79c74f5/wexawurisuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=raft+survival+multiplayer+mod+apkPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 10972 bytes
SHA-256: 079583f66833ae36e89db1af35eeae1b6c0cc5582d44791482f83faf05296a68
font_02_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 14196 bytes
SHA-256: c78fa4a5fb6718a15e27402f8ad58b0a824478546fb403afc5f924cb9016a469