Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ddbbff91433e30…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 21:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b203344df2a1ae3ea320060804154bdb SHA-1: 18c1632061f5c543601b9b9c82b0c3ae21b631ef SHA-256: 28ddbbff91433e30728f3d3a325876e83256bc751d17fd7211f241e395ae70ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=test+success+test-taking+techniques+for+beginning+nursing+students+free+pdf PDF link annotation
    • https://datatech-int.com/userfiles/file/51372462953.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/dofebanik.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tubixabevamazubifoto.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/8096763341.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/mugiwovufadazexofitife.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/84779131425.pdfIn PDF document text
    • https://socardan.com/userfiles/files/55645738395.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/sesora.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/64315296859.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/16387884352.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210902_013640.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/dubexafefabesisaverir.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/60858297968.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/88280863065.pdfIn PDF document text
    • https://tessuno.com/upload/files/6138f9f6783a4.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/wululilivoju.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/gumizovemekuzufojewad.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/nobinisuvazuxitowu.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/70384051862.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/fejop.pdfIn PDF document text
    • https://alpinashop.bg/files/xukalapak.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/raxemaxifer.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wuvabalasoxanekaresegawa.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/16649006270.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/96218558890.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_off0000bab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 11328 bytes
SHA-256: 7200f216bb80ee7b1775a39d727a8fef2f656dea94ef78a5018b3d14f744a181
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 17000 bytes
SHA-256: aad3ea4ca1aba5aea39b9cb197cc960950e1317abc610d94309897f12faf7091

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