Malicious PDF — malware analysis report

Static analysis result for SHA-256 36597e730304d3cd…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 09:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed9547f3543c0019b4fca7990fce60b6 SHA-1: e2c3dffcaaa4b4d5d6dafe9c834315e083271842 SHA-256: 36597e730304d3cd74bf5a304102b7c6e0c4b9bec8cfbeea1b0c2c8d3de7b223
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://tmtteks.com/files/dojopunexuwinedewesa.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/xolezeruko.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/47892347885.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///govipewizovi.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/48122237546.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/xadege.pdfIn PDF document text
    • https://duvanco.be/docs/files/48855473983.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96671fa52---69706475415.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/84946616842.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/kaxomokikov.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/43085190065.pdfIn PDF document text
    • http://jucal.es/images/file/zimumawenivomafoje.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/98841748713.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/demiwizofiwaxagumef.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/93493ad93ddb88f405bc3bba9fa6424b/63318932086.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/305712795.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/79824281789.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909132105.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/pidogulaxiditavilanomamaz.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/27014070846.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/balogolawoniwi.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/76216958387.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/rukoxozimoxe.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/12867906421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=3+player+games+indoorPDF link annotation
    • 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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 16500 bytes
SHA-256: bbd98872fbb67c16d0f4f279c97b0c111b1cb6312d1243ba398a370dc6bb9811
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 10828 bytes
SHA-256: 3d7dc059d07e171c392beb942cdd630bf49531737f14b9f5f814b720297acec1
font_02_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1