Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e30e34e3877d55f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-24 03:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ab5c9e519843a2813319cfb58f55bd6 SHA-1: 3fe1e9b18dcf747bf0326522d51412fd49611165 SHA-256: 1e30e34e3877d55f1b7b6a6b07e4666c986708653bc5234dcb3f6142e765821e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=god%27s+chinese+son+pdf PDF link annotation
    • https://suthuytinh.com/app/webroot/uploads/files/wojomuwu.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/35783379161.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109201929522047472nduegjrnhf0.pdfIn PDF document text
    • https://theipbuzz.com/images/file/62049433411.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/4417029841.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/97296588249.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/33900863196.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/viwirojodojozufa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614844c1cbebb---vadibanorunekulavon.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/80127973133.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/vereboxonaji.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/80223158926.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/wigidumewujadag.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/punuwef.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/7402206496.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/37962678011.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/nijilagewesatofapisemip.pdfIn PDF document text
    • http://ccshecea.org/upload/files/32756853433.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/56044991976.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julubagezezuju.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/419659c5857fcf8cc26331055a20ccad/fuvodesigakomufamodagafo.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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10384 bytes
SHA-256: 83223f542937894003a3c00f569a39e60e4ebbf32352a27e8a2057b92993d3a9
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 18112 bytes
SHA-256: 2ba25354263f60727a607b7c72f462c4fb73a47fb67cbf56c60b0240101cad8b

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