Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6ca3f281939263…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 00:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 653da3b4d04bdd020af7b049d0914a36 SHA-1: 02ddf4efaf7e3724240146be8f5780b75a4dfaaf SHA-256: 1e6ca3f281939263b98c3c2bd7572d4e6063a298ff6ec8133aebe95c9f66091b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to phish users or distribute further malware.

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
  • 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://synerhu.ru/uplcv?utm_term=how+to+unlock+samsung+galaxy+s4+pattern+lock+without+losing+data PDF link annotation
    • https://aodaixuan.vn/app/webroot/upload/image/files/votewetarenekunanipojifin.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/69222438446.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ccd4abe89de0d0fc3b5033cc80a0ab98/zoxegi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-2/20210902043019514131.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/78358498169.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/29559507850.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/88594439185.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/89146128600.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/penatejadajanewikolegab.pdfIn PDF document text
    • http://surtek.biz/image/files/20150322_202123.pdfIn PDF document text
    • http://mqskin.com/luutru/files/74569346832.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tuzogexikuluzadoves.pdfIn PDF document text
    • http://dsfly.com/uploads/files/pefaxifadakegexumofelenek.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kijijiramobupudazagoxu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/fosixawopexo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6d32d6c---tetewujoni.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/4447310184.pdfIn PDF document text
    • https://value.ae/userfiles/file/kebexabuziwepoxad.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/63455189125.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/vikatogewixamed.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/lotimazoz.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/42120332605.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/33638950548.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/10657914221.pdfIn PDF document text
    • https://serka.com/serka/upload/files/newivukoburob.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_off0000c237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC237 17660 bytes
SHA-256: 074d550a435c85b18c17eabe8b43ba276e75af159e5b354ea476bfc2045cb120
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 11524 bytes
SHA-256: a38eca4ae79860a464b29f116a59f03665e547af7747ea5183111cf762f75d00