Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3074fcd7b02877b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 09:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8420c0b5ec761ad627b9dd274f2011e SHA-1: 8023dd0aacf9376549c83b92520759ef37e4feb1 SHA-256: e3074fcd7b02877be306062d1e4287a38e5062bdd7e06eaad90f9d24ceded58a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://nuocmambason.com/upload/fckimagesfile/6edc5e241a104be240bdba701efdfa92.pdf In PDF document text
    • http://zehanbiopharma.com/upload/files/pulefugisa.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/81039566916.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/kesumavodapujis.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/8453103211.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jetolexed.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/tebagoxe.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/danotulopufazokunuwalubub.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/80508837539.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/lewaruzev.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xuxun.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/doxipesu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910221141661453.pdfIn PDF document text
    • http://klenderbio.com/upload/files/3269373175.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/gerowetabanoxeb.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/684510495613c36981237e.pdfIn PDF document text
    • http://le383.com/uploads/files/gifoban.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/dolakubedurekaxorubo.pdfIn PDF document text
    • http://capableapp.com/uploads/files/69740802864.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142ca1d1196d---dogumevisofatorewikobap.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9045hrvnaf2n1nqi8pgr4chsvf/33309168773.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/18065313095.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/66385469280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nova+3+apk+freePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/sowufobolatajijozibilaji.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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 16660 bytes
SHA-256: edab0bcb7cafa0685ff8884afbc676825b6fc6efe055db23d61625900d17bb96
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 10152 bytes
SHA-256: 25873adfd0e3b49c8f6a59c6f827a53205cbad606b728390000fb99a8dcdbc41