Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a45462afaf18e0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 12:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c34a569654a36563e63353d2ed97752d SHA-1: 40939a84c7fec9e4993085ee1c8a9fb01d5d98cd SHA-256: f9a45462afaf18e060dfdd5e513b28d85fc92413d1e09fcae595cb2446327374
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a phishing lure, specifically a payment redirection scheme. It includes numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into revealing sensitive financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=how+to+get+all+contacts+from+one+phone+to+another PDF link annotation
    • https://terracell.pt/images/file/72885805822.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/tozuforifigarajofuxu.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/gitepevepupefexipo.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jipigarevuxudakomej.pdfIn PDF document text
    • http://master-br.ru/img/file/41068732994.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/7655331777.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/rexupaneboxamoboribene.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/woxexekasi.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77844816902.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/gijakebewefal.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3a83dda8---44096923117.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jijobegikit.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fb217b302b139366426596a436d145db/penipubuxanibil.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/447656d0b8c96bf5620756c4583c1378/zexisuralugupebudulixikur.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/wubovimefozonubowarufofa.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/legeke.pdfIn PDF document text
    • https://sanagustin.cl/files/76591906097.pdfIn PDF document text
    • http://superazs.ru/images/news/file/68330192042.pdfIn PDF document text
    • https://kimansion.com/uploads/file/lisogikotifuvivat.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/44726785789.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/lapuzupunir.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/61812996974.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/xujabuzaju.pdfIn PDF document text
    • https://campermagazine.tv/public/file/lixisavavanavogumimowof.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_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 17704 bytes
SHA-256: 4333289ac6eaa00a66555f076d4fd47d4252560bd16af35360bbfc86c9362987
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 10912 bytes
SHA-256: e94ef200c6469788daa8e50f9838edb3bdf543efb1f3826b21ae280b80b25a6b