Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99d28ed132b7506…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 13:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6190efffd445370cf63f0bc0fea7e88c SHA-1: 85908ed20df104589c2447b710e87a26dc2aa010 SHA-256: b99d28ed132b750652feb119496a61529d61a99192e6f77ae8ad8b14e7895508
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting its primary purpose is to redirect users to potentially malicious sites. No scripts were extracted, but the presence of many external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=top+movies+coming+out+in+2021 PDF link annotation
    • http://cosmoscm.com/contents/files/55123276358.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/daxomoxibol.pdfIn PDF document text
    • http://centronegozi.com/public/38399182198.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/92676754931.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/34296398602.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/zonowaguta.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/63068172225.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/33541148725.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615003565a4b6---fipagulilewumatotokamajo.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dokedojiwejetijefudib.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/26762225205.pdfIn PDF document text
    • http://lulanjina.net/upload/files/gefodazimejuporosumefava.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d034e8f66---bitowasunaxelusuxoxugose.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/79559367886.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/49400644240.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/48087750611.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/52127971022.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/fiwexepoj.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109032155358245.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/22131013090.pdfIn PDF document text
    • https://zhansq.cn/upload/file/polem.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/87689425493.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/62478449779.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/nufenusugo.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/xipatotozubakuxug.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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 10832 bytes
SHA-256: ab77c42ea9fd142ed2fceaa432bd98f5d363367ef51bf7c02d5375b1efca8982
font_01_sfnt_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 15324 bytes
SHA-256: 72ff548068596a31d37874b03b572d7fcb626de318ee9f127aa4be9cabdc4df7