Malicious PDF — malware analysis report

Static analysis result for SHA-256 349ce26b42275f51…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 13:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6607d39c1fca3b3120490d9dc3018103 SHA-1: bd101eede18ce322e622ea3cf61424a41550b7f5 SHA-256: 349ce26b42275f511b012260dc2aca288810bfd0a00061caf69dce9c3af611f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JS points to T1059.007, and the nature of the file as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=cool+math+games+moto+mx3 PDF link annotation
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/dulemedunelutuzedi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/15168505776.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/13272265134.pdfIn PDF document text
    • http://scantech3d.com/files/witekuginuvelelelito.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jegutarinubo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/duzanofum.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/vovurutodipokusizidumemu.pdfIn PDF document text
    • http://videocycling.info/files/file/54117915023.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/xovevawebaka.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-16/20210916153547910685.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/57271881207.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/81409643673.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109062143006112.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/zilutuzoxuzinetesuvoluji.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3f1034f3b84b300cbcb8d838f4f84356/34119957713.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/96406832502.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fujagoxopixejotajegalijeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8289ca0c---43919095419.pdfIn PDF document text
    • http://canadanur.com/resimler/files/gijifemuvametunirigagowo.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/feven.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/64714780342.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_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 10564 bytes
SHA-256: 4295693dfc001ad0a4a18a00183684234c8f576995c65b153b6afb25b1b03089
font_02_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16512 bytes
SHA-256: fc45a205ad3d23ad54d672170cc8937d971136f69014880ae5ee602bce5d8565

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