Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca99415dafc06554…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 20:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ffe32dc79852cfafe4f873a615f8ecde SHA-1: a8b186d28c2a8073402237a363ca0ca5c14547eb SHA-256: ca99415dafc06554c5661ea416392d64f12fc5e8b9631f901caa503d480162a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to numerous disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=thoptv+apk+dot+net PDF link annotation
    • https://thietbixanh.net/uploads/files/91450089742.pdfIn PDF document text
    • http://sciattella.net/images/file/91975228291.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/78718476825.pdfIn PDF document text
    • http://373113.linker.tw/files/rejaxovekat.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef6d7d5082---31039131005.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/jeruxubo.pdfIn PDF document text
    • http://saktigroup.in/uploads/87987298952.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/dadodoz.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/16848562557.pdfIn PDF document text
    • https://edusfera.pl/upload/file/83802554969.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/lojumegalatudetivuzob.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/31803879155.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/56454509420.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/miwolelisof.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fubanonufarip.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/60862384899.pdfIn PDF document text
    • http://camonetinternational.com/files/file/36506824593.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lamudejigumavodaxepevaf.pdfIn PDF document text
    • http://cjatkinson.com/userimages/tovepusononeza.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/98301066386.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091609145067.pdfIn PDF document text
    • http://zeci.nl/im/image/zezopobatisofowewuzobo.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/67172761539.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/tobovipiluwoxonajoda.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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 10204 bytes
SHA-256: 9d58beccceaf50a19f11b1b13f47a9610d5e151ecf0af63b042f13645201a284
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 18120 bytes
SHA-256: fa191d7355a9a486c59f9905f86bc50ab5854c84e926e522caf88d685b2c12bd
font_02_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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