Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17ed2b5fcb753ac…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 11:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 965cc17741dcf0f8226c356fbb2ac5a6 SHA-1: ddbccdf2fb7f19032a1cf0e00c4d5db0d6e5a26f SHA-256: f17ed2b5fcb753ac1a1fd104a71779e17b6f18faf93b89e1e2cbd771c2c7364f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613480b447400---zelenamifilaba.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/17310413893.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tubibejol.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100910507246.pdfIn PDF document text
    • http://ropesadventure.com/d/files/56006636350.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/fofagap.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/57759723982.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/mosoxezumixoko.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/sakunelasonototukuvajikeg.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/32004095715.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/dakalodajunirufuveri.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/70556758899.pdfIn PDF document text
    • http://greenbrier101.com/userimages/zofexu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/jebibakepoziperiregile.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/39673215968.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kitesefixujap.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/38768063369.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/vapad.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/35872890337.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdf96db2e---84317906780.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/74873078948.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/19400272431.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/vuzasarexera.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/xetewusutabiwonovexezul.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/zibosijitos.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/58232746577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=aiyyaa+full+movie+download+for+mobilePDF 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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 10736 bytes
SHA-256: 473b5596f0cc66965072b7a6ab5588d88b8200a0ab34097160435b1ceb3289d7
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 17224 bytes
SHA-256: 9eb61d2d265e6b8df26d924a882a17d28cacd042f00e202835c9104d4988c3f7