Malicious PDF — malware analysis report

Static analysis result for SHA-256 840b594d682cc0d2…

MALICIOUS

PDF

90.8 KB Created: 2021-09-13 19:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bda3652de4d5749625c2109a444f72a SHA-1: 7ff3cd7c9953aaeeaff6b4189e908f1bd8679bbe SHA-256: 840b594d682cc0d2a2c8cdc0c3fde7ecc57a0af4577ed8ceac55e0bf6933504a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=against+the+fall+of+night+pdf PDF link annotation
    • http://marjoleintje.nl/include/userfiles/75670879160.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/31028406863.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210911071342_567055012.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/viviwo.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/2192998864.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/4009763892.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tenoxadesoxuxosirerifoz.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tivojejeguladimejil.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/mobagajewibadoditolazi.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/93952896198.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vobokil.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/16150419311.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/91666397744.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/81903937587.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/90928075369.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/15741392625.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/lirusij.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3ubkmal4ep9bvvpkdkf13v98tt/68485270728.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910102510.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/wogidemewif.pdfIn PDF document text
    • http://muszempilla.com/files/file/juwuv.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/muwatavubogo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e36aed8a4---75274068676.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/98037377675.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_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 18576 bytes
SHA-256: 265738baf92259bf5ae12c386dde0d72be776a3aa133b5ee75e2820652a0eb6e
font_01_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 10660 bytes
SHA-256: ff2fa9193e68e39889b6290777e6dadf68eee8482c19247208e99f25d54c83ef

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