Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc40972e5346dfc5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 02:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2746d69ed6de54d3ac69956fb7592ba1 SHA-1: 92d78071deef3379376d975064968382931e537a SHA-256: cc40972e5346dfc59abe3e2498650345aaea23ddb2eaac89a7f14dc488dcd1cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and numerous external URIs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the nature of the URLs suggest an attempt to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=subway+surfers+hack+version+apk PDF link annotation
    • http://kpotplace.com/uploads/files/wonutuverikur.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/domunikutifileka.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/585218384.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090500111080554.pdfIn PDF document text
    • https://digireg.com/upload/12984505049.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/52397253934.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/48602243270.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/fepupilazidetoj.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163221587112.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/mobumofezo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/494e04c78af218d2e6f875cee0f97445/69121563840.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210925162720.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/94886703624.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dc44864e---girubigosupobenegoxitesu.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/jowizuwudirafe.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/vupugusufadaviseveguwazu.pdfIn PDF document text
    • http://trovas.com/userimages/23393000837.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/gedafuluxazix.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/nazugudebanaxabowozuref.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/tojomejene.pdfIn PDF document text
    • http://fabtur.ru/upload/files/10766623222.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/defewodokubopexenagatiji.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/ponejuluzarasamo.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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 11108 bytes
SHA-256: e6b07973d2eab3ff3114734a78f6cdc6fa7cdf2dc8930b13d73f62e66fe13c15
font_01_sfnt_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 15588 bytes
SHA-256: 670f46638a5a904112c366299d2764175ac1547e7621a1234d863e2b794c0a35
font_02_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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