Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fe2dbdc5f138db…

MALICIOUS

PDF

86.7 KB Created: 2021-09-23 09:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ed858dbb3cc9a2c717ddfba768c610b SHA-1: d682c3d749b76a15996699fc88cfedd6603feffa SHA-256: 42fe2dbdc5f138dbd07d43d53eab3af742497c9dd3ffaab67adad378cd35d978
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=beaconmanager+android+app PDF link annotation
    • https://basealimentare.it/webroot/files/fck_uploads/File/jebizetelawimoses.pdfIn PDF document text
    • http://scarpatti.com/files/43097876187.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/45285650609.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854dee708c---45696111564.pdfIn PDF document text
    • http://knipia.com/userfiles/file/14210426504.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/32795388022.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/nulemebazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f65717051---14180686133.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/gorixo.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/patefunotalojulonuj.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/59771859605.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/zawolidebamirazoxuvofidiw.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/sarukogolimaduligutunedi.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/6466583272.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/pupesalelorisaba.pdfIn PDF document text
    • https://recrut.com/files/files/59505825502.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/48705308674.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/95267267967.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/boxafexapo.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/rorekonukifafirowemotu.pdfIn PDF document text
    • https://theurbanthinktank.com/files/kugatumefe.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0351e4dd0cf74af070283cce4ee198c8/raxarazewitujeg.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zolovosogilajidijijo.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/99572508340.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/zoletanufolenadumemal.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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17180 bytes
SHA-256: 2cb1767c7048fc0e4a0ce57a1af59ddb48b96a500611c0d64d238654bf4004cd
font_01_sfnt_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10600 bytes
SHA-256: c4c136a2a87f97bbcca8631f1461eabd137868aa5fcca1bb34cd13676d57f454