Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2b121d7900940b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 05:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 034410575445af9719b250efb39a5fad SHA-1: a551c35d2367d96cf9c391dbcdf1102370458dab SHA-256: 7d2b121d7900940bc2565f63eefc27346aee5da74eadf5b0a34bf9845fa270af
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=best+football+streaming+app+for+iphone PDF link annotation
    • http://studionegrelli.it/userfiles/files/64421975469.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/5213294583.pdfIn PDF document text
    • http://scarpatti.com/files/xarodev.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62615795784.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/mipugokutevudipitinug.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/75446281510.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d5a62f5f5---60032569897.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/18419629480.pdfIn PDF document text
    • http://chikatere.com/Upload/files/jamopojiruketowadijabix.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/tixux.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jejurerugalezogi.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/vujujomizunuxevikidometop.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/digidutawekexerurofemob.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/27287627532.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/nusimulajijiwis.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/tageridanubesit.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/gosizupaxorikilupexovira.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/76707723233.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/wotoxuxike.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/695ee2d200bd563f6505be3ddf2ce114/pexunoledu.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/merujolenujo.pdfIn PDF document text
    • https://andana.us/files/files/96403435476.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/97641697154.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/zofiwazowodajupewafepazek.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_off0000bfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 16320 bytes
SHA-256: 718b8b4e3fe37134c7327e9e93eec8c9f9440c6f3919ad72e425fa0357cb2236
font_02_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 11000 bytes
SHA-256: d4e4df4f522b7764965a4e0fead0b612a39498d35e2b6833fc0a1da945f098c7