Malicious PDF — malware analysis report

Static analysis result for SHA-256 3266db50a2600ece…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 16:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3737e5228fd709eacc6b66bb7d7d55a2 SHA-1: a9a2f1fdde00376c14ba5c65288325710051a5e3 SHA-256: 3266db50a2600eceba2da80cfac7d10469f5874a16708e073eff69c27840d0f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://invest.pl/userfiles/file/252055661.pdf In PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/71284201605.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9f77fbf2---94007643225.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/tufuxiv.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/nozeguradifilisirizu.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36562933521.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/20913356980.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98072943491.pdfIn PDF document text
    • https://harmony.im/userfiles/file/20668380649.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/85790240721.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/sinegunidimimajakoteneru.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/83484661968.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/75933031409.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/ziwuz.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/bufazuwoxitetapur.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/96769546567.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/82507207535.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/94200207275.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/19441908015.pdfIn PDF document text
    • http://ministerium.pt/files/bosekanudiwe.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/41186945661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=emoji+differences+iphone+androidPDF link annotation
    • 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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10852 bytes
SHA-256: dcf1b1b17263eeff68dcd8946909c8e3cb8488661f4c84db471ba9534f50f5f5
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 17000 bytes
SHA-256: d3d0dfd052409c8ee99cc25f93ed61ae704801388ea2fd3be48aa239866b4338
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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