Malicious PDF — malware analysis report

Static analysis result for SHA-256 99566db64540a856…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 00:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 301135bd69a28db50456803b4c99da0d SHA-1: bc791ec8d8d62b580cd4894407e1e58736b3f911 SHA-256: 99566db64540a856f5c392899f19092e78b7bf5ad8de6f88fa6a03ac062d059a
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and contains no readable text, but the presence of numerous external URIs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://krisoc.ru/uplcv?utm_term=tour+guide+app+android+studio PDF link annotation
    • http://anbao.vn/uploads/userfiles/file/kurevufifiraso.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/susutekak.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/89946113415.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jejavimeg.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/6289760982.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mefunaposunilew.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/juvov.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34503621384.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/81926849995.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/desitebukenuxojive.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/femuropozarebide.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbfc24383---petegulevosimofajafinovo.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/62365997051.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/59353719412.pdfIn PDF document text
    • http://aviatroglo.fr/IMG/file/30598257511.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a87bb39bc66649f7507c4f3c82a58035/kovolifovuvodijuwovumobub.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/70140134488.pdfIn PDF document text
    • http://apicn.net/upload/files/gutugenugel.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/42464427680.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/nujiwadudoli.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tadabigupixo.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/71244037258.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_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 10584 bytes
SHA-256: 0374f1e0e991751b57dfc7fd713492a0f631ddb0c0e832d06fa72ec4a0af7844
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 17640 bytes
SHA-256: 49c849fe96726071ab4391b55f5e860ab547fac849251b52816e03d48b87ccf7
font_02_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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