Malicious PDF — malware analysis report

Static analysis result for SHA-256 da914ebc37b322e5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 22:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a7cf8613be4e53e3ae520da5a70d574 SHA-1: d6a153956d3b08bc9887aaafe5f1727a20b5f3e3 SHA-256: da914ebc37b322e5c60b7448bbc10d46e39ce328d5f2cf38d300841165bfb139
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malware or conduct phishing. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=sideload+launcher+app PDF link annotation
    • https://inprovitparaguay.com/ckfinder/userfiles/files/46049107306.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/86294262800.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupixatetikupa.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091514513012.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sotonu.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/29035677821.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/57333173709.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/23834125990.pdfIn PDF document text
    • http://eichler-kammerer.de/22152341899.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/27832913567.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/madovodasobuwupatodota.pdfIn PDF document text
    • http://grossbuch.com/upload/file/kejidelim.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/zinisujisurupilenoma.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fusesidodeguwexokivip.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/penevixuzavuledogono.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/73946186631.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/gogipemojodoxobitojizaguf.pdfIn PDF document text
    • http://onlinevay.com/upload/files/gamid.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/10786636450.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73540549491.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/37063591795.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/18920975590.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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 17892 bytes
SHA-256: 9baf1209bb83a7f9d24d6679183cc638fbe23ec06cd536d749022d4d33bdc69e
font_01_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 10520 bytes
SHA-256: dca5bccb0f9c599506b4f9e883741750397caa344a421f250eb7ecaf6319672c

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