Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eb2d88077b35be…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 03:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43f386fd95caa294684a11a0679f3568 SHA-1: 9c8646a064c08e8bb4b092386be9c522ef8b541d SHA-256: a8eb2d88077b35be8c9f0342e8ca31bfad2a6ce27ffe0d51a833c0263590f504
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier with high confidence. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms. The presence of these links suggests the primary purpose is to redirect the user to malicious websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=learn+to+fly+3+unblocked+66 PDF link annotation
    • http://universalestetic.com/userfiles/file/20376457025.pdfIn PDF document text
    • http://sjhtractor.com/d/files/93031054196.pdfIn PDF document text
    • http://bdsductri.com/upload/files/sukeg.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bixinu.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/31527263520.pdfIn PDF document text
    • http://pjteam.hu/uploads/zapubizifokokovuten.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/gidawaxowufukox.pdfIn PDF document text
    • https://plasy.com/uploads/file/fenos.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/zarisetupakilosuzenove.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/jeboloxufeleratajezujarud.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/rutiritikijoxin.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4eb92494---bivifujax.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/rogibegonuxezixovuzenitov.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/kaxajib.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/49342573547.pdfIn PDF document text
    • http://aa-nusd.jp/vajoreb.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210920/file/vulekutikafiwufulisogan.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vofigov.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/topejolejisepesar.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/4213313874.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/rakuramixajexolaloludata.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kuvomanumewezekivaxiwu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146fbaccc50e---xoruzegabid.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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10952 bytes
SHA-256: 63569d23dd56a8af1b7241a5a4a715c9f253c4521990a90a0a58e3036b1f2f3c
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 18300 bytes
SHA-256: 7c353857d71f1048b22849e106d487e4c130732b78e8f502c8dda246701c1212

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