Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d57be362565705…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 10:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb03f895c512454f201e06133227348f SHA-1: 2b5cad43b461213d832bf522e30126b788733e9d SHA-256: 93d57be362565705643bbaaf8a879c3b95905884fe2da3e2cf4b6518aec6943f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates the document's intent is to trick the user into installing a malicious browser extension or update. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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://tch.lu/files/files/17661393406.pdf In PDF document text
    • http://nineslash.com/user_file/file/duzaxunivazomuj.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/petepupowidagew.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sefatu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/pudejomefinodas.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/43133245119.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/50206300945.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/97391782283.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88778362226.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/78177026969.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210902_002247.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wekuxe.pdfIn PDF document text
    • https://shibbirs.com/media/files/48657529827.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/28788282702.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/nepuzalumozevegejeravifug.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/69841925683.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/38405838701.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132714fad946---rasaxili.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/durisevalakado.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/liredunaveperikedawakul.pdfIn PDF document text
    • https://kristinanamaste.eu/files/76953875705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=word+document+reader+apkPDF 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_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 10552 bytes
SHA-256: 271d9a355bcbc2aec655287191c9e1748ba0bf58a57f5ecc33af8012b914ba35
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 18448 bytes
SHA-256: 15e70c2b2cef5d26bb1c3e24a40cac0bf0457f5f1d70cc0b9bec5d25d62b6f40

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