Malicious PDF — malware analysis report

Static analysis result for SHA-256 c401247f6746b2a5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 01:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f56538d27b6b1d43371a6229be600fee SHA-1: c6253ffc7a079bcc1e3e5ae71a075a6e6f7d3b96 SHA-256: c401247f6746b2a5fa159c86278b843b1b91547a7a9ad038d3b76eadf9dc09af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's structure is designed to host many links on potentially untrusted domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vinadesigndanang.vn/uploads/image/files/fesifubajovare.pdf In PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/94254924055.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/77544011559.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/fomuzikoretogozox.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/zadijasidewotugal.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/doreriwupizi.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/rolemapinidekenego.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/dirawaxunukubekupifidud.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/wafadigaduwefug.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/6485555269.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/lapovesifusabejep.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/zigegavugokaxuxubidijum.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906042027905.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/wokagogelodajudokiva.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/xusufodi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jawedozotizonizi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161373d8690ed2---mukejesowakiruwej.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/mozaxofuwo.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/wusomubuxuzilavozosen.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/topifuworuworitenoja.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/88219375063.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/70610890527.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/96287445395.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6283809689.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/bariwepod.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/wakumiziwadakibuzitese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=words+that+describe+people+that+start+with+nPDF 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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 10832 bytes
SHA-256: 6b93b1ac32f234fcc29a6826fe6c33b73784db90763bd531dc3218d841bfe1ad
font_02_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 18128 bytes
SHA-256: f381b6848aefab7bc9f0b8afb8e1ca01dcb4c4ffffe931ae7387c255865f7a7f