Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39eba6341019225…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 12:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e129430dbec0557b4e901552bbcb246 SHA-1: c463575d1d239a647a1bd4f744759fad09f736b1 SHA-256: b39eba63410192257489fb00811dcc59c6775f84e43f8fa989d27a243d1f43bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://queure.ru/uplcv?utm_term=5+abiotic+factors+in+the+rainforest PDF link annotation
    • http://lysfyyy.com/upload/files/7099276810.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/wirinus.pdfIn PDF document text
    • http://dr-temt.ru/images/file/53723445712.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/serul.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/86485002892.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/pimageb.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/89789142219.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/20297973211.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/77223936393.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/bafiloxija.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/pilixesalasirelok.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/52258319667.pdfIn PDF document text
    • http://teplospectr.ru/images/files/60216175202.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///momimuki.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/38841751691.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/18900846951.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/7891747377.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/lazabobat.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/butedekarifatozarovefa.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/vunipulukafixaw.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/fitegu.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/56453007592.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614289ed743a4---39494199315.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_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 16964 bytes
SHA-256: e296bca0b43acaf63a3139f4cb39db7bde9cb2e8fcffae4c3ec4402aa0b26413
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10564 bytes
SHA-256: 8ac86f7626ed827ff186666b18a2899156ba23879e48f19f83a665560461f88a
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.