Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b0b5737c6f89b5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 01:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b1a04e233220e12607be1666c3cf899 SHA-1: 0c87651b29f41172157868f0fa81f376b23eb2af SHA-256: 22b0b5737c6f89b5d1297ee6ee8a838828dc7d9306c036f88ec0ec54fe9655c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=systemui+tuner+apk PDF link annotation
    • https://dodatnagarancija.com/userfiles/file/vudofidiperufej.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/94575354761.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/34306023533.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/59751353395.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/kasavom.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/13687309445.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/dilig.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630547542/files/59143089692.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/57537592244.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/podusulevunanuj.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/jorexa.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091805071173499.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/67061189423.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c0e8225e---mixiraxoxifuxajed.pdfIn PDF document text
    • http://cke.hk/userfiles/99468242863.pdfIn PDF document text
    • http://salt17.com/userfiles/files/27819454481.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/babebukobuta.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vometufe.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91183830881.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/tudutibe.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/nifavu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614507b0d7736---81484437048.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bowupige.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/80341400348.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/wuzijipidisod.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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 18428 bytes
SHA-256: c0eb40903a934a7213f268fd92c3c5e3e0312ce40c9dcbe2a2c2a56c0f23f158
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10628 bytes
SHA-256: 58afad1764d0fd4a290d0bcd5770907329ea00903c726392fbdbff4767557fc3
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1