Malicious PDF — malware analysis report

Static analysis result for SHA-256 8837d70de789f5ef…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 08:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47cf2877be175ff04b996db8bd484cf3 SHA-1: 65a32f98155dea450c30a078b8319228d368e8cd SHA-256: 8837d70de789f5ef28851d5e36fe094d4c1cd589a6285592a82d2416d8417013
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=download+region+restricted+android+apps PDF link annotation
    • http://mrhobbscoffee.com/images/uploads/file/masajowogamosimaverorez.pdfIn PDF document text
    • https://umartravel.com/files/sexuwarezogi.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/rogaxarajetuwexuduf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614160e0a33fc---19946872043.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/wupukuzusat.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/guferobudebukutamusetis.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/ponuk.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/32692745594.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/61514613078.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/15200176483.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/vexegabafefeletil.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/35647865590.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/telabetewitoweferilegid.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/44140139523.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/63834502274.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/kekitasotivet.pdfIn PDF document text
    • http://robedecreateur.com/img/files/71798116344.pdfIn PDF document text
    • http://reylab.com/userfiles/file/51145377537.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/62d88650d7b978853e9a088262a18d03/torakejibetajunifew.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/savevefoduniron.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/digekijuvefipenowogaguz.pdfIn PDF document text
    • http://full814.com/upload/files/dojofuk.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/matiri.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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 16948 bytes
SHA-256: 72625b23b12b27987c70947440926185670cfb2baf2a2532160996ea9305227c
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 10776 bytes
SHA-256: 468109a114940e338ab1787551f2cb594c21b278997407849b6f5d67159ace78

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