Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ce2e6abb7317d7…

MALICIOUS

PDF

100.5 KB Created: 2021-09-09 17:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2bb850733f7a63dbdd4c069364bcdc7 SHA-1: 2a0bf736ba41c93dcb89f5ab194118ee6480f1f4 SHA-256: e6ce2e6abb7317d702ecef153a418465008a7053b3e59b00e8413f02e211f8bf
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://balogmihaly.hu/UserFiles/file/xatajunuwofobajeme.pdf In PDF document text
    • http://herium.net/FileData/ckfinder/files/20210907_049AA25488DECC12.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bajuvaduru.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/kakejepatujulo.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widotifuvezetapuwadu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/97876961073.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090204220254.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/6339560199.pdfIn PDF document text
    • https://go2germany.ru/files/file/43251369140.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/sedesasuxagunar.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dinetonasavaw.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/rarigavaraworutev.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/61901715663.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/gurovidovopomumorepefa.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/xesagepigosavuz.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161369c367c274---51258900098.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/45c410c4ac405646d41e1bb273e93203/80276973509.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/potelenapuponuvoj.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/35526841909.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/kixubabozalan.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/labalalivodutegog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=where+can+i+watch+sullyPDF 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_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 18212 bytes
SHA-256: c9913cd202cfc1b8dd4fc953ab7f6c53aba2a866afee8504d75f3ba22f6bc6fb
font_01_sfnt_off0001547a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C91 10500 bytes
SHA-256: a14e1d809b92a4606e47d8bc014d35a1e75a0fd4b491da377179a537cc9b6244

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