Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e5435179265f7b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-24 09:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c12be4b27152d0a143a72491793bd78 SHA-1: eb7b3ed64bd7a9060ac74c5e2738be151103e366 SHA-256: d8e5435179265f7b56bc8117a3b423e1ad18a29146daa406e6b40e7fe9442455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the PDF is used to direct users to malicious external content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://miraclechuppahs.com/userfiles/file/wogijavunutoveb.pdf In PDF document text
    • http://sdsenlex.com/upload/files/96843847013.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/zofemusareximulaloj.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/6027604284.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/68214154816.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/58321431434.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/kovirilewilejedumigux.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/ranekoxezezifor.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tojejabatakujapezebovov.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/nedatojifatugejutid.pdfIn PDF document text
    • http://weldingplaza.com/files/file/vuxuvolewuzimisusuvitolu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397832ed494---20491562191.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/10269679509.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fapifejat.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/47736876007.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/waweso.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/55943468582.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/tamedawakobuz.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/34693123859.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/99410659543.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e7cba94174c306e51e614e54062268e7/nujoxisojepe.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/jivilapuluwina.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/vogumejugugirezosuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+android+google+playPDF 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 16232 bytes
SHA-256: c332fec289724b2b698c48f33ad7119413fc547f1f6b1dba778387429c7e99f2
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10776 bytes
SHA-256: 46b9377799fbdc0e32bff206f04754c94650a4f3b2729cb49614fcc739a26c08