Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a806960074b80b1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 05:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33a71b6206a655d41318c73ec0885198 SHA-1: 81b26b0978d28571d6cc9fb3f9b0f10f414574bb SHA-256: 6a806960074b80b13d1f1c305d20b61b92e84db86eb2b51e453ae9d6a9e7c0fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vipnovini.bg/root/f/uploads/files/14565864389.pdf In PDF document text
    • https://granitabrasive.com/editor_up/kamamovusovirurofonokabuk.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/loxaxedalefugijomanawexub.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/34201382120.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/nepolidi.pdfIn PDF document text
    • http://lblussana.it/images/file/73231017354.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/dekodifizizubede.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xugux.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e7rr9897876fiq2pql35p11en5/47976865765.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132521d4daae---18381945165.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/rujinuzonirux.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/petosegomigowu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/13474104239.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/nojejumazojedinoxoviv.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/96663490419.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/58151042350.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/4466448842.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/rijepake.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/86689606470.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/bopiwosikupo.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/domunidipexuxenovakumuxi.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/75077077698.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/poxitimapagegaluzo.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/23705598915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+see+battery+health+in+androidPDF 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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 10676 bytes
SHA-256: 6ac6026aefa3ee0fe6674b8b32530d86475e7f3aee003e58aa9d772853eb153f
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 18128 bytes
SHA-256: 20117109f766f0b26337c8df800996063c88dec7ddb7f066d1f8cdaf716e92eb
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1