Malicious PDF — malware analysis report

Static analysis result for SHA-256 b116e50253b4acef…

MALICIOUS

PDF

81.6 KB Created: 2021-10-11 15:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3934405547dbee59cf24062da91525c1 SHA-1: ccb3090fdd43a194d3d613a0e7c8f4ea6f4e529d SHA-256: b116e50253b4acefc87d727802c699e6aaf545d1870fdd08ee6bbd2a46b422a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm by heuristics. ClamAV detection and ML classification indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=my+vision+and+mission+in+life+as+a+student+essay PDF link annotation
    • http://shijijiaming.net/filespath/files/20210902092806.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/94858519037.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/wiwufalusuruliv.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/24372719263.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/rubunotuveruxamarogetewe.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/mupojarexonek.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/tivilenuvanar.pdfIn PDF document text
    • https://dukupahit.com/contents/files/48467788440.pdfIn PDF document text
    • http://dakov.hu/_user/file/dodamewewidurabopuvesuza.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/lamajupetelonufotikixop.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/powud.pdfIn PDF document text
    • https://hssanesteban.cl/files/62250727071.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/24289811073.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wizezumexuma.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/bulipazasejevimevupuz.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fijujipodiwosajutubefakel.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/zananunapav.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/sirivorukidanokeritep.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/nikumobezixesira.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/30094600942.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/27630819286.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/60780575733.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16159833925dbd---11399535361.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/didubuvugebometafa.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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10688 bytes
SHA-256: faf75d927a6b654c3ff6157a3b92fbf18a9584771a322923c4af2e24772af927
font_02_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 18436 bytes
SHA-256: 1800f6b32fde408dca0e9139cc3bb71da3b733f09c85f142ffc6c122ff82599e