Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d6ddb329846137…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 09:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35948c80868acd3db58447e6bc9d5b44 SHA-1: b1ae608e3fb29cf44c5201a990f4b8bd1dd75a58 SHA-256: 85d6ddb329846137197f5a6a4457f7a4ced85b252f94a4d7e8df9b87be0e63f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further confirm its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=flash+firmware+all+devices+android+tv+box+fix PDF link annotation
    • http://jfhcoaching.com/userfiles/files/66330908970.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/gaponovanaru.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/31222779063.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbaf9e22b---vumur.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/teraresaxowegarufiw.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zififilewumelusukaf.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/semofatoma.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/88211572400.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/94183678645.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/pefodomozojuradamegeralaf.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/61354286918.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161484ce400230---mejote.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/tamobitebuguxef.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/28147290513.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rejukepeseso.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/15650475639.pdfIn PDF document text
    • https://davnosti.ru/upload/73577828513.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613791654aa47---24087383363.pdfPDF link annotation
    • http://vuoncotichdep.com/upload/files/febuwefegoza.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/duzubopa.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/gixugedapeg.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/77026668817.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/lavodinini.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/nefopu.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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 11112 bytes
SHA-256: a1b028bfaab5ff968f01ec604f867777491f0009a6e819b1ae1f2778d6c1bfc5
font_01_sfnt_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 15740 bytes
SHA-256: dfd1d91e2d2da086962e5e1ec72387deeea6fb7537306f0defd2225e5db4b9cc