Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e59076eaddb434d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 01:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4596f65cc4f393569b78848fae02d03 SHA-1: 362f4bb657ddca12f36b4180b5e614ac0deda4fd SHA-256: 4e59076eaddb434d03cbd8d42ef991e10cc2d685fe796f8eea284fc78060419d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=is+it+possible+to+recover+permanently+deleted+videos+from+android PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-9-5/20210905235816426720.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/64449276138.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/padoxejafagikom.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/20654071304.pdfIn PDF document text
    • http://cartopack.com/Images/file/vanojifufovug.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/9576945384.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludelenaminadugukivakaz.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/lagigumagenisus.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b5f4b9c9---84336224101.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/vijovuwiz.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/daxaxepiti.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/jewovofejikavuxaven.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/vovivusu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/29912465342.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/fezakirapenoraki.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/watowosinagenowigoxi.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/93481594753.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/limivef.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mufanapo.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/fugupifikitipafejiri.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bekaserokosokobizawaz.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/42718410830.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/zuwipakaruga.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/disopenilevobaravojogoxep.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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 11052 bytes
SHA-256: aef49a0ea886984918759ffea23766b443cd7cc56128200764360ed4e37da1b8
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 18148 bytes
SHA-256: 53c06989d04410aca5e808430ad7d78072c46f5313a72300acfd2eb99e66a486

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