Malicious PDF — malware analysis report

Static analysis result for SHA-256 e646ca64ede431ea…

MALICIOUS

PDF

97.4 KB Created: 2021-09-20 18:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6ae2305e33a76667723d69bbfbaa5ae SHA-1: 63775ad74bbb71d92ec73120a0d31b57e90693f3 SHA-256: e646ca64ede431ea425cb007ceec5fe10e6ed01342e7ae05e414833709ba40c5
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a URL containing 'dark+book+of+spells+pdf', suggesting a lure for potentially harmful content. The PDF's structure and the presence of many distinct hosts with few links per host indicate it functions as a link farm, likely redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dark+book+of+spells+pdf PDF link annotation
    • http://buddhavehicle.com/userfiles/file/bunuloj.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/46031453612.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/12514483845.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/58015913512.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/darufelajivukuvo.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/nifeduneroxalijanoxeta.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/8116419531.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/turuwize.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/kesewoma.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/fowapafinezozabaki.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/97947387314.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/roref.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/34138791464.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/nakajedaneme.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/satakepebedode.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/80353820057.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/69657559337.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_8F9F23B093522C49.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/54123079650.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/dodiwetonapoxapazalemo.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/36615238283.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904114443.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/62d1f1a1237fa54be2843c8af8a12a49/7803865040.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/69148774561.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/66804149111.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c516a052a6693f6a4a33e64e2e8156f8/refemesunor.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_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 19688 bytes
SHA-256: bf22199b4af79507caaf6643c2b22e78450c9bbc6e01d38b79e56371a12471bb
font_02_sfnt_off00016009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16009 10432 bytes
SHA-256: 7a6869387e5e232e43273dabcff7d6b399e97c4a0fa074d979e4dfc4aa7ee093