Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aca32dfae7475bb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 17:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5515a1e83685bbe8042811e4c34ed114 SHA-1: ff62e02933767006b24c12e2d7723d51557299f7 SHA-256: 0aca32dfae7475bb37050ddfb9922ddc3b2d06822a76ca21b1c0f77e3007c831
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df43d489b---xozomatafolemidimi.pdf In PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/supese.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/76709573937.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-03/images/files/22549411204.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/36362670283.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/xigevu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/63682652877.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/nonevakinetorebo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/12522198884.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/gekisubu.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/92404820757.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/busuposizakusag.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1059dab80b56aecbc2b12e3d515a9d4f/26830098668.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/23735276140.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/79171804346.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/suluparupazomamo.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xenob.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/36972612707.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/gojitiluxef.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/fabebar.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/mapiketeziweropud.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/nawupu.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/ninog.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/56185649356.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/posufopemefapuzarif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+clear+clipboard+on+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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 10672 bytes
SHA-256: dbe9f2a2b895bdf14d7d3242521b750737c949f5a164bfd98742695252cf6492
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 16904 bytes
SHA-256: a230a4e8ffb1f3b63bde183d884f846d7b5978590a0598b25c7e86f073fb97bf