Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb47b0839843796f…

MALICIOUS

PDF

67.2 KB Created: 2021-09-26 06:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5b4fb96c5b6b88276d7ef38e6471c01 SHA-1: d4988234897b73722f3db4aeb4d95766c2995206 SHA-256: cb47b0839843796fea7fe6d80e1677ba3fb5504e7b0cd3ac438acbc6cf372fe0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are identified as part of a link farm on disposable hosting. The presence of an IP address literal in a URI and the ML classifier's high confidence score indicate malicious intent. The document's structure and numerous external links suggest it is designed to redirect users to download other malicious files, likely disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://varbackaforskola.se/ckfinder/userfiles/files/53735712247.pdf In PDF document text
    • http://pc-driver.ru/userfiles/files/sujazazibepulupibe.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/14421207717.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/xewoxujiwazonuzozetojoda.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/262942721.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/vemolam.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/duwoj.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/womibupasodafepexifubi.pdfPDF link annotation
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/wudutovakiwarijexal.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/70159599812.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/69985638459.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060712002615.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/jixesofobufoz.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/gojevaripepizubidiwuzo.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kesunabujuxetodagilepu.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/pijatobazuzavexili.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/52621732693.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/57974228697.pdfIn PDF document text
    • https://zhansq.cn/upload/file/purasekakipewo.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/jiwibidox.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/18780053177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pubg+game+download+koreanPDF 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_off0000aabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABF 14652 bytes
SHA-256: 21cc7f038204cf72934617fdc8854b0d4fa0a4f4e8b02e951ccfd52440670bc0
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 10652 bytes
SHA-256: 93c10cbd4c088f6579855a3970dcbbe8248ed421c9935f376ea4aa2981ce2c6e

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