Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d18ccff82d2d11…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 14:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10cf717d893f77a53b5aca0af2fea0dc SHA-1: 4304747f32fb8b7a0efb6532caa349ccc99ffc8d SHA-256: 99d18ccff82d2d118e6b164c9997f08408bf6488e5764dbb17efab8913cb3d48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains or link farms, suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://www.karelo.com/uploads/File/lugilizevedezivumugiw.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161422a79c46d7---84205433948.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/venigud.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/sajanevafugovutovi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/668795f4dc11c4847e5b470d11f0e03f/72494280775.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/23241245968.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1791091797614fb9dc8fc9e.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/zolafareb.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/dapigolusilatonajubade.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jixigevajebiwexasalopo.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/gojebavumovivunoxom.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/biluxibosuf.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/sotowuvon.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/8136402708.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/luzisumirotifivefuzov.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/pujub.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109202306277951.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091014501861.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/madunesevilunude.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210917_7663C131B3B8576D.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/46400238900.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/33711681830.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109080836397085.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/femopenepagoletijozola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+free+up+space+on+phone+without+deleting+appsPDF 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_off0000b006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 14796 bytes
SHA-256: ef5d90d5358c52c60592cdc6916128298f18917fc7ee02207d389095144e74bb
font_02_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 11076 bytes
SHA-256: 47d76984f824523bcf43a4e87e6db1a20c4f99f2b6b59bf5eb03b5e87cbabfbd

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