Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbe0b2349995f7d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 07:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbd35c833bb27b2d1d5373f252673e4c SHA-1: dcbf8d5e1ad18fc88c14ce6ef216f50e4854c99c SHA-256: 5cbe0b2349995f7dbb157dede40160c412f416e1a68c2dcc0b4c730480b4c0e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for phishing and malware distribution. The JavaScript likely redirects the user to one of the numerous external URLs found within the document, which are likely part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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 http://primaria-ciocirlia.ro/media/file/nulameximenibupiwujibiwi.pdf In PDF document text
    • http://ecole.ru/text/images/file/20890419473.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc30050580---2333676823.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zuvobufuxetiwemutatibapa.pdfIn PDF document text
    • http://stylekd.ru/files/95174300991.pdfIn PDF document text
    • http://wjcopy.com/upload/files/nakajarusoremakuvo.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/gefarenesibatuna.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143120729d2f---39607407879.pdfIn PDF document text
    • https://banghenails.com/upload/file/24394448354.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/28587496731.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/83801461273.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dazikefowovaboto.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/povaguzevo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/38672856361.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/40479479721.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/loxoxekukexonejegalemola.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/49011670185.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gabodulizikanujafatafijez.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/73173957918.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/zosidozolokepaxobivogo.pdfIn PDF document text
    • https://aildf.in/userfiles/file/65563699863.pdfIn PDF document text
    • http://maihome.hu/admin1/file/famenovojavebuse.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/22066928587.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/vamerotapurato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chicken+cross+the+road+game+onlinePDF 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_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 10940 bytes
SHA-256: bbdb4b1e5a20d604fc4dac8aa064b98a60747bce77ba0e21329c5fb46f52e69d
font_02_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 17020 bytes
SHA-256: e6be0aed8392f82762855d3cbbb43d7b2a28b5f4d70041a7c4c1b5ce156f30ae

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