Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4fdcb413711cc3…

MALICIOUS

PDF

73.8 KB Created: 2021-10-01 08:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 565bc1c638925b29d7d99a7d09c3646d SHA-1: 0c27b60a9fa9bbea2c0d93f35c1113494fd98c01 SHA-256: 7d4fdcb413711cc3f222b40d1a8b149b51e2ce8343b8fc5b8f8ad6046e1c760a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, many of which are linked to disposable hosting and appear to be part of a link farm, suggest an attempt to redirect the user to a phishing site or download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=frp+account+login+apk PDF link annotation
    • https://hrmconsulting.biz/upload/files/50921270080.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/suxin.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/186265057.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/ririxarumesal.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/lebobima.pdfIn PDF document text
    • https://izometal.net/mm/file/xilumevasaduj.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/53578655739.pdfIn PDF document text
    • https://abss.pt/userfiles/file/sunemewo.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bexexagojabovemibalotad.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/69722712428.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/58547616791.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jorepobipa.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/99067076782.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/suzem.pdfIn PDF document text
    • http://mobiliteit.nu/files/91599278823.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e2f33a472fdae76ace6094446d5119e5/40146772551.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/suxuvamelasavab.pdfIn PDF document text
    • http://aec.dbodm.com/js/upload/ckfinder/files/rufinenafovinif.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/41174621172.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/94130286095.pdfIn PDF document text
    • https://bandloc.sbchecks.com/FCKeditor/file/11782672398.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/rokimazowamupum.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/57642689045.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/wonajolon.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/wodonopa.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/mafodizekabud.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_off0000ba01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA01 10416 bytes
SHA-256: f3ac4c8ef90301a1130d8d711997fe979ff17965902e9ba8c4488163a9f281df
font_01_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 18340 bytes
SHA-256: a33d033044c6d2232c023abb2af88fdb93ccae92ceedcb0ec706b0ddad54c418