Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f60604941654e5…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 13:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6546c053bf01d007d96fe777de2b277 SHA-1: 69a08a74286e36456309dcc266ffe282afbef458 SHA-256: 39f60604941654e506dd7c866a4e30b19b46f7035807ae34a3fc9056902ed7a9
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 PDF also hosts numerous external URIs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://laborke.ru/uplcv?utm_term=the+secret+novel+pdf PDF link annotation
    • https://redfortfireworks.com/ckfinder/userfiles/files/zimojositobowifamatok.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/ninoserokixavifudober.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614eb3020746c.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sozabokapasoru.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/2347078577.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/60141855612.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/visinavo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/77433968339.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/69931352344.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/13552838030.pdfIn PDF document text
    • http://kaies.net/upfiles/file/29912848966.pdfIn PDF document text
    • https://digireg.com/upload/dopivabibizuketutofimebir.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/63552803260.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161496c02569b4---deronuguti.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/vofamaxipoxibilu.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/zamebodizakok.pdfIn PDF document text
    • http://budka39.ru/files/84246350230.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109132307204167.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/94858678976.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/fafedimuzaniza.pdfIn PDF document text
    • http://eternaseguros.net/files/files/37817910498.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431910a3e96---71393422458.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/97944278470.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/pagifasi.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/ninipujoxiziwesarow.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/zafezotefibixuxaxopatax.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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 15900 bytes
SHA-256: 594ecf118a4da97c0cdcb18e863ccfbd0f5775224c30b44d6465cab4c2470299
font_01_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10492 bytes
SHA-256: 20131359512ceeed76fb5215c83e1bd9036f2db2025ee2cef47e50fd7662c544