Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb54306c8ac572…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 10:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6372ef582498b4f6271385b6466de2bb SHA-1: 12462e3e8af0916d245dabb13ec78664f8da15bc SHA-256: cdeb54306c8ac5727f64bc258b2bd0756209583d862d33a36c28f2f1b9c855b7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JS suggests it's used to initiate the malicious chain, potentially downloading further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://crysiq.ru/uplcv?utm_term=animator+vs+animation+android PDF link annotation
    • http://samtle.net/ckupload/files/vakozisuvomudenixi.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/71282359629.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/44321851964.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/revelelevupanevag.pdfIn PDF document text
    • http://qdcmd.com/data/files/kosewirozenojesiregamofu.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/16302404499.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/35913406143.pdfIn macro / runtime command snippet
    • https://tvmreza.tv/ckfinder/userfiles/files/tabepibisurujoxizavoze.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/wuwafutepitefuj.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090706495751.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/72283844239.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/26112179415.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20452345509.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jojuli.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/tazebuzelak.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/60818481151.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/fisiwabunasewak.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/49351135004.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/misilujakowarojikutale.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136697227489---44301478595.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/ginug.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331fcbbe615---gasaxaxapavo.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10324591039.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/55125493618.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/pirunowafi.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 10276 bytes
SHA-256: 8e17ba8de5ae54a227ded12450d4ab552eddfb48faec5781f7c422495d8c1418
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 17304 bytes
SHA-256: e9bd83328711d61e4987bec3667ca1a381e8580689707338b9ccbf5059b37f9b

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