Malicious PDF — malware analysis report

Static analysis result for SHA-256 47220fefd68e7d93…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 03:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c08785c7a16ed1d8d720e7af32935cc0 SHA-1: 7032f4f6849945d1192ebd5c685a082374c6e773 SHA-256: 47220fefd68e7d932860a8ef4ab41b3aa7d476becbc1544fb5319ad62af6d843
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dycmc.com/DATA/upload/files/202109050227026991.pdf In PDF document text
    • http://art-lan.ru/uploads/assets/file/76982357693.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/13906790372.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/55118505771.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/fowegadikimun.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/80940410060.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/55009439293.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/35386843752.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/lobawevos.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/lolamusawekuvenomod.pdfIn PDF document text
    • https://sitarasign.ir/data/file/95219535427.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/95499330543.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/toditepizaper.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/vejibaderisaju.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/pedipinolorekadigope.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabekixiziwazudumonaraw.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/ganibub.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/ziketatori.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/13671924156.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fezudododafupadexaru.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/pixivakefowowupuvejugox.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/70079296994.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/tivateganuwabuni.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/77832751594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bgmi+hack+mod+apk+downloadPDF 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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 19388 bytes
SHA-256: a250c04f9fdde7373d264d6bd8408878673a359719e58db3c452b4b02ca5adce
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10696 bytes
SHA-256: ad7ebfc91b4bca66acccff2f214504cac890a5aff94a7b1ee584280a492cd191

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