Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a87dc8a0bc9929…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 07:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c0000bcdd75f4e573ad1af020c9618f SHA-1: 1ff4d7d1b8713f500c4778fe60e902e17f64a3e5 SHA-256: 83a87dc8a0bc9929ac26b536c49e8f357b2bd30f274a9cbb521f923d9fa12c65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to potentially disposable domains, indicates a link farm or phishing lure designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sun-green.be/ckfinder/userfiles/files/80327609618.pdf In PDF document text
    • http://seibyou-koujien.com/files/files/guzorapepav.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/11061435781.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/92128533549.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/67462326999.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/sufupegemegatexap.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090508465873499.pdfIn PDF document text
    • https://apra.pl/files/file/67641311060.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/49300315835.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/peveji.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/ginetuwotumolezo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/sawasibazomos.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/bitanupomasuwoxidimuvusif.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/xaxajenevinol.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gloo9q3kmn8knmtq9ql9mdjg9o/merelaguxugesew.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/bepomajapudav.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/zizubabajugegavolavak.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/forevuv.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368f612ecbf---59589702126.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/63225711499.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/juxusegetekefo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/kebewume.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/birejukedotutizowufo.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurosiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=name+the+smartphone+brandPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zekidijixinub.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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 18552 bytes
SHA-256: 6192bf0c64f6a300ee66424325a955e7afcd43206dafe1fbb3f7f05099b2700d
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 10636 bytes
SHA-256: 23b7fc4ec87981f18119e553d0511c5e7366d02b04c0dc029863a616e9df6e57