Malicious PDF — malware analysis report

Static analysis result for SHA-256 d847ee72a90f46fe…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 02:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6a0ed694cf8d9c4998418e19a054c24 SHA-1: a838e9452a2bfd0e4422e836fef28cdf197c700d SHA-256: d847ee72a90f46feb7e09af0e26738059c0ce756cffb1c9a205239aee3a236a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'synerhu.ru', suggesting it functions as a lure to external malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=dbz+xenoverse+download+for+android PDF link annotation
    • http://www.hgbehringer.de/img/files/files/xuxepisadumabuge.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109241255328028.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/1959072399.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/simogipiwukukulog.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614944dd96979---49069139677.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11726106241.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/texabewagekujupubobakif.pdfIn PDF document text
    • http://freestyler.cz/img/file/luluvekibegizotemiwa.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/ditezem.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/nilata.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/67476637949.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/28170054847.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/61070190606.pdfIn PDF document text
    • http://iscelenie.info/files/file/46257292805.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/walulibufowavebifetobegi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ac2a9cba---2240109820.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/65703144347.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/bebifarum.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/90948154236.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nijekojiza.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/38375478801.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/11781354812.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/91888540648.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_off0000b016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB016 16560 bytes
SHA-256: e8df0d4bc030feaa091f122385170de5ae240e30883101c4dde79288dd567454
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 10704 bytes
SHA-256: 21cccb4fd286614f84609b687a62a96bd55382e15ae44dd919389d86da40e347
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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