Malicious PDF — malware analysis report

Static analysis result for SHA-256 0adc062cb90d4f13…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b99a57c521d02abfe5a8b9be09a0aef9 SHA-1: 3336e8338b8c8f9c08d9b1eecd98697583ac57e5 SHA-256: 0adc062cb90d4f13ce3d26e3b77f6549424b6d4a7212e1ba08a560858ae7bca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is designed to redirect users to numerous external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://www.alitec.es/js/ckfinder/userfiles/files/tatikusujavikakexinizi.pdf In PDF document text
    • http://jcpingie.be/public/files/19616788624.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/26645497199.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/53032598438.pdfIn PDF document text
    • http://nature-revive.org/files/file/54997054547.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/57000831579.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/13801162990.pdfIn PDF document text
    • http://rnralpha.cz/res/file/5483225412.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/dinebe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189451aff7---veworojabekunonos.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/84720843226.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vurepokomoxez.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/16708062953.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/11596859307.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/21186208834.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be01327cdd---wolowogaluvarevezaxe.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/viriguniwosijewefizugafi.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72372044705.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/laxipixib.pdfIn PDF document text
    • http://iknow.pl/files/file/pesaxubegabe.pdfIn PDF document text
    • http://dsraxys.com/uploads/komazifinibip.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/45126836984.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/fapapawije.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/77290631489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=honor+pad+5+updatePDF 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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 18820 bytes
SHA-256: 9263479d7840c20108f54fabf9cb484375fd9a862ec5c4944beda7c1dfb4dfd3
font_02_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 10304 bytes
SHA-256: f9bf6597f826c4aa1c81beeaf90e2214911fbbb02412f0bb99dcaec82d42331b