Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cefdfd202cb017…

MALICIOUS

PDF

96.9 KB Created: 2021-09-11 19:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e76dfc972376f5d20ea825ea85de6595 SHA-1: f03ac19b3b02cc4289537c2c3e782e2ff7b1c616 SHA-256: 09cefdfd202cb017c9a6b994dd403d731b1f922e5a7fcb35946c3c2458894ab7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high-risk heuristic indicates it's a link farm. ClamAV detection and ML classification confirm its malicious nature. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt via a link to a secondary malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://neboskreb-irk.ru/uploads/userfiles/files/fogub.pdf In PDF document text
    • http://stamforgtechnologies.com/uploads/xuteligavugo.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/103938677.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/kivus.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nagemipatunad.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/bowidubagamurisadasafole.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/2834205101.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/sirukobefodadunimog.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/70585749264.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/83667737092.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/13712873503.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/17322265180.pdfIn PDF document text
    • http://tiquital.com/documentos/file/1192899758.pdfIn PDF document text
    • http://devveb.net/userfiles/file/43689209555.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/57683578750.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/jufapezo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/2798626849.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/vofusubuzudokuzizawogi.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907013151.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/mituvu.pdfIn PDF document text
    • https://alariel.be/userfiles/file/luxixaxemiwoved.pdfIn PDF document text
    • https://noddy.nu/images/file/76726476773.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/vagafetiraf.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/11040159133.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210902181354163.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/34340343096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+application+stopped+unexpectedlyPDF 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_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 18648 bytes
SHA-256: 74a658731ae8f3bf85bcd39621c4675fc64fb84ba03ead0f40a0e448d254f1f1
font_02_sfnt_off00015c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8C 10804 bytes
SHA-256: b9c442d04f159303c74476bd6e14f82065011ba82f00e228f4c35811755b1471