Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d91262b9cacf454…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 23:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d44e69e55c4898cc0769cd04f7dbd6e SHA-1: 93fa1bfe53370d456fc5b3b0c091ebef3cfc9b02 SHA-256: 4d91262b9cacf454fd65df023b26a04b0548048b39d389c34dd0de1bdeefb8fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vasekurzy.cz/userfiles/file/nikozo.pdf In PDF document text
    • https://kimcert.com/E/file/76744903183.pdfIn PDF document text
    • https://emmaushuis.org/pages/9648627691.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/72736809582.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/paxijerovezejekize.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58906994689.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/zopuzojipovujanerosin.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/wijawagozani.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/63032790522.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614041d741e5e---rafeledizolorix.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hd9i75j50rgc3svvue2b9d9nuq/supowituw.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021913195401153.pdfIn PDF document text
    • http://holzbau-napetschnig.at/27908403284.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/95540644497.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/rojogutuso.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/48949405664.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/87249459671.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lixafujuputikexovenoguwub.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/67562700239.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/96395557362.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/38154480487.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/25637855960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=attack+on+titan+volume+23+pdf+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_off0000ad80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD80 11128 bytes
SHA-256: 0f81d3d9580b26b558dc510b51bcf7dd00a096bacef70b332e49309608544e5e
font_01_sfnt_off0000c7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 15236 bytes
SHA-256: 75d23f9dda6c3165919c3195748dd7a5b32134cb3552c8866f9bc067879e4269
font_02_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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