Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cd02cd872e8fe0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 23:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1cecc3d6ec856c7882f002259c62ffd SHA-1: 1468c918b2901d7634a57ed7c4e41cf69999a801 SHA-256: 95cd02cd872e8fe0130cdd3a63e9d2feec5e7033b4d352060fba2eaf6eb6fca0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed a link farm with numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lumieye.com/userData/ebizro_board/file/biduloxozejutiwi.pdf In PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sodoxoxita.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/17078372146.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/zurepijitukiserafes.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/riwofetevowanag.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/10456549086.pdfIn PDF document text
    • http://analhospital.net/file/files/41539367866.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jijusaripufewedut.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gudenobosudoxumegudenixuv.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/titozevuzilo.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/19631812875.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/99531334023.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/92295265971.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/45779810686.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/45644310326.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/sakim.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/70244445503.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/benidejinokisumodatixara.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/bomebitivuw.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/gobevewojugobisoririg.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/27582456501.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/godivedabuzimejajamogir.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nogifufop.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87619496325.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/16616033644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=samsung+j7+prime+launcherPDF 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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10960 bytes
SHA-256: 4173acbb22055753b8e0eaabbbdb1518fa702849110810a870e0229eff4257d3
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 18260 bytes
SHA-256: b7cf595b54f448e7eea6accf6fe96711731a6983e91a8802a3b0c71f8ea86201