Malicious PDF — malware analysis report

Static analysis result for SHA-256 de44b536d5da09a5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 08:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6931b5d004e6ed9e2aaec24c28028fa9 SHA-1: 3ff3cb3462339cdcb33099d66ae768090cc068e6 SHA-256: de44b536d5da09a5d9a07abf39a4f7331e23712898f72ab224626d8edcce6a3a
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. The presence of numerous embedded URLs, many pointing to unknown or suspicious domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed as a link farm on disposable hosting to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vpecargo.com/userfiles/file/pojazisepozevepuf.pdf In PDF document text
    • https://podimercrm.com/img/files/16282209236.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0586b404d97d3f5b4672da32ae2acfb/47291015843.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/93139947349.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/kavevajopitavalaritikofin.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zakar.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/35554252906.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jakowifewopobowekujinor.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/nabekedajabiwaloza.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613011676d67b---posejop.pdfIn PDF document text
    • https://designclarf.it/file/figogosobisiziwazexonew.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/65055291066.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/24949624616.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/21420437492.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/nikinazu.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/45851480660.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/nepupu.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/nuvugaj.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xizetujemomebukuporog.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/badezofuxikomavibogetob.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/buzekil.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/jevufutilowusuwewokugigiv.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/sebizi.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tametamigiwejuvamixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=las+aventuras+del+capitan+calzoncillos+pdfPDF 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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 17468 bytes
SHA-256: 6f90550fe222ae7a3b74cc663dc4ad72ab023eea4fff4740d75822eca4a4716b
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 10796 bytes
SHA-256: c7af6c6b1e66b99fc8e073bbf99ba2711e0fce249d7dde8a00c680c8a409f1ef