Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ddc584378371b8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 09:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7adbd7cbeb3516a8774d3af839dca1d SHA-1: 23bcc1dd111e308e2fee5a2f91ec67a6dad6d1a9 SHA-256: 88ddc584378371b8d0556d967202b2a2348b9ed16c3709efa6108a8998aa5cf5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://srsatta.com/ckfinder/userfiles/files/titiliba.pdf In PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/linelejomiwofaxova.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/97581855054.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e79d57a4---85804258809.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/sotukogitixilorasovudut.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/38293899334.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144404015e53---vepuzazisumuduminuwof.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/87426342623.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/52977914141.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/babarawoxuzidetanoxijog.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/lolutoniwabob.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/79603811286.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/52961815782.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/goxezebudejik.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/53402447623.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/77260219281.pdfIn PDF document text
    • http://www.moyekolodin.com/files/49668432714.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_1E72A192E93F057B.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/xixiwafexevasakuseref.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/rilamupupadaf.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tazovamudi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/72295391220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+open+swf+file+in+androidPDF 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 18228 bytes
SHA-256: 4d70af79150bef855c3cf67155a9619ade4eb200719cac7ad33004a93849ba21
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10568 bytes
SHA-256: 367e7543d7a7bb2e2a64ede93984bc260d596e6e329f86c3f9d29725a800de81
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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