Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe5df7e238a3e41…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c143cdfd04836f3d98bf4293f9b9bd0a SHA-1: 9b49a721167b389d957f60d9f42935b86f2177cd SHA-256: ebe5df7e238a3e41f43ca4eb689a32b7da5ae51189f7a3909bd82d939dde9952
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan distribution. No scripts were extracted, but the presence of external URIs and the link farm heuristic points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=mediabox+hd+premium+apk PDF link annotation
    • http://aallergy.friend-match.com/upload/files/bukidotatadosulutu.pdfIn PDF document text
    • http://cl-pub.com/files/files/16061602837.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wepokutusudugeluxaroxobiw.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/womozabelomipos.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/1003084194.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/902956186.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109120714134817.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ditawuxiniguzazu.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/rukubiniwesulewit.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/newevosomilufilum.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/2477823261.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/32964529557.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/eb9e5b1c815cc1e0289003053ec0c496/23943943639.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/79893234518.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fagovu.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/89853769103.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/64575153217.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/walobidisakido.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/gewagikokerowig.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/22712255160.pdfIn PDF document text
    • http://schturman.ru/files/files/1271528790.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/relawavelike.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/pinopinisonavizel.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/solisimuri.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/dakexumetoli.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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 10668 bytes
SHA-256: 8230ec19d69db25c34f570d81b6a3dd8dafc56ea9b11e45a3598b87234912833
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 17672 bytes
SHA-256: 8e864d607240422156dbc7d1ab27b644dd65feaaa58bd231f9adbbfad923e328
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1