Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0408c8b47acc3a4…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 02:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc4507bfaa001b114f8465752b8918cb SHA-1: 172923fec8aea3e2ce91f8bb2e98b30fbc565179 SHA-256: c0408c8b47acc3a4770fdb7dd2757e69caf78ed3e816b4622e0309cc37012116
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 suspicious domains and are flagged as part of a link farm. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being identified as a phishing trojan. The presence of external URIs and the link farm heuristic suggest the primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://binarbaidfabrication.com/public_html/userfiles/file/lisiwejufexebaj.pdf In PDF document text
    • https://halkapsikoloji.com/userfiles/file/33788531581.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/dogagurunike.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/sevuvugemegomanolimifum.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zosixemovikonosonuwu.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/88103004607.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50081735403.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/gapubefiwuvufomakoxe.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/dezojazosaxokitorixo.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/66339510100.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091302193673499.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/81353703501.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/dojoziwibanizufezodiwelu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/puwolufotun.pdfIn PDF document text
    • https://razredna-nastava.net/files/90735467195.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gopoxaj.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/95803409530.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/wopesuwuno.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xudatukesobule.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/xumidana.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109221816565394.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/kavuvepomoviwogigixupeb.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/tagesalasapujewijofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=one+night+stand+1997+full+movie+123moviesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec55adbd4a---39751680730.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_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 11452 bytes
SHA-256: 81534b100be96510d171f70954a13bde41b31346f7f728c8750150d12ae285d7
font_01_sfnt_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 17444 bytes
SHA-256: f8bea26a8908b1c237c97e11582e6ac3bd1914b61168af07bfd572d60b997fbc

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