Malicious PDF — malware analysis report

Static analysis result for SHA-256 8422d2a95bc4b72c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 02:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6f25d5bdca165a607ccd9c91c2e2ac0 SHA-1: b537070a902dcf6ed70a48c8ed434b9728756bd5 SHA-256: 8422d2a95bc4b72c8be3d2fdf1356b0841d0b60a7f2068af397ae6218102509d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious PDF files on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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://due.pt/js/ckfinder/userfiles/files/xidexuvunadarokexafovusoz.pdf In PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/takuvajegotufazipub.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/57186748701.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/tomelakikovotaxujevaked.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090723490916.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/girepulileleberak.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/12621647642.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d08f09688---giforatajojuzagefez.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/24858665186.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/50931515830.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/76551695525.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/bibexepuverasupumadulovos.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122022529308.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/5324933874.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/nopemutus.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/xadurenatod.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/budezetasuvuxonaka.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/gimuliweripekewafidefito.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/nalikudifosapitus.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/kuzalurasikolik.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/25692720798.pdfIn PDF document text
    • http://geotersrl.it/file/zaweparagawafugodavalegu.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/tikugeb.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kevomidozorajof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=galaxy+note+sign+pdfPDF 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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 10828 bytes
SHA-256: f387adee2ce8ad786b9e4e3bce5c432ac4585ea91ea39805457122acfef2d918
font_02_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 20644 bytes
SHA-256: dad87fcf5506795de0b968ebf29fdb3671d8376bdcad54bda5cd7648d9b0f3c5