Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1bb8b1b62d4510…

MALICIOUS

PDF

87.1 KB Created: 2021-09-24 12:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcc69fc8ed0f4b73015dd74e88f243f1 SHA-1: 88a239ac5a875d9298661eae33b2819ae8b03355 SHA-256: 8b1bb8b1b62d4510bca4f01d99ebc56b2db0ffdebfa322745bec4a460091010a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://huntic.ru/uplcv?utm_term=best+android+game+creator PDF link annotation
    • http://naoshima-tours.com/images/blog/file/78034835421.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/20811699577.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142465b6c04b---fatefopojojinidewajis.pdfIn PDF document text
    • https://dafelia.com/files/wodij.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109041021448489.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce91dcb8c---runusaz.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/98439704320.pdfIn PDF document text
    • http://voijin.com/userfiles/files/jewidapumixa.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/febujokototo.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/52134046072.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/61919092880.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/fuzowi.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/fejigofowolop.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/79729472133.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/fobixoxivotavuvamobafuk.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/nepotidebegutij.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/74991132865.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/tolozikapufo.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/49885990938.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/gapakumuxikotoxerofatig.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/bejadapos.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/vusuxutirixupog.pdfIn PDF document text
    • http://adveotec.com/img/file/53627783814.pdfIn PDF document text
    • http://p-energo.ru/content/file/sedofeguxat.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/99190806956.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/gugubavoperowerewinutusam.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/99746979247.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_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 10720 bytes
SHA-256: 6bb1231e6276c2cdd10441c0a493f23107b06406b6bfd60fadf03f09f3c77e90
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16612 bytes
SHA-256: 9dbb5f1467b69c5910a07790f50e7b4728d36b6ef9e447a31eb58d4d81b43687