Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b95ec042798c8f3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-10 09:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2b63d9bcf2022298466f2b565e7c701 SHA-1: 3ce952e2449a1854a975d128dea9238dd6415f14 SHA-256: 5b95ec042798c8f322afabb49ed529d21cf8fde7efc5c9f0a8a0394aa840e428
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to various potentially malicious sites. The presence of embedded URLs further supports this, indicating an attempt to lead users to external resources for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=download+pictures+from+android+phone+to+computer PDF link annotation
    • http://jubileejec.com/userfiles/files/luxaxizenudigane.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/tezulopez.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/72367389222.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/dutikojobatizuz.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rirenikag.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/mefumi.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/73057455427.pdfIn PDF document text
    • http://wernitznigg.at/files/39859319934.pdfIn PDF document text
    • https://parfumzone.ro/files/file/23340775.pdfIn PDF document text
    • http://hotechike.com/files/files/90245230834.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/26571240662.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/34102359950.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/46156431484.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5286b78367052b973be1d971f25bac76/19669707013.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/54737926843.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/lokevemofovolijawiku.pdfIn PDF document text
    • https://digireg.es/upload/vasojajoxabematowifos.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nasazefifekaj.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wogatuduves.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/xepamatubodixu.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/ranotebufogukotenogazun.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/maderojitepexasufesop.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8049adbd9---9560246834.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_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 18072 bytes
SHA-256: 600dcac129c004719fd0263b57bfd88a05f2a1cc0385eead6cb6a22db0b34ebe
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 11072 bytes
SHA-256: f85216c3caf44c02deb1bec32211dfdec9b652fa035637e25d078784ce38d4c3