Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6823d22c3c96c5…

MALICIOUS

PDF

66.5 KB Created: 2021-09-11 08:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: d846bbe5db451c9e99119be765d3a7d3 SHA-1: 41b1c7af2d4605a62957142ee0d98244bccf26a4 SHA-256: 7b6823d22c3c96c508f115d9abfa72ab2cb6948ff1419f434d9847329c6332e4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to various sites. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5541

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.
  • 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
  • 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://limsurdua.com/contents/files/sifowilu.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613105fc6fe6a---goxoriponezaxefemutewavap.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a024ae81a1e6704dae83f9a51efca8c1.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86433429458.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/18707339966.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/46245408110.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/ginevamen.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/47277932785.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/83900997569.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/tibemeporolekedij.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/58270942629.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76395804023.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210910_181751.pdfIn PDF document text
    • http://domario.ru/userfiles/file/88326531543.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/sebasejerubikezoduviziwum.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/wenisajobu.pdfIn PDF document text
    • http://knipia.com/userfiles/file/79694593048.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ba1d5d6d---96409419864.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/bobobedewaripaxugewenoko.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/zosuwowazuxusemiponuf.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/jimulejo.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/56419353166.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/lufonagokobig.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/36996507091.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/mumisas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=print+to+pdf+windows+10+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 16448 bytes
SHA-256: 50f746e4428622962813ac463698a9967733f9a5bc5f723d5fe760581bb80005
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10752 bytes
SHA-256: 1fe96aba48771bf17a003c6fac1855d30d43f25454e9031d7f7d28d4c9ba0a4a

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