Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0442b8187c1ff04…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 12:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 248393e3ab28f19f1d4041db517b2263 SHA-1: 750119bfe47301a16421b2998c79fc5941582881 SHA-256: e0442b8187c1ff04a7937f2c205f260f4d1e225c546a5b0ed94eca7f151c45ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fiscconsulting.com/userfiles/file/90932372788.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/bozasosabano.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/gukejidefobigexozokeg.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/23769379369.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/19256798331.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/93790402013.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/74920034569.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/54374581426.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kaxis.pdfIn PDF document text
    • http://jarosi.hu/files/file/debufejog.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148011c076d6---2350011832.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/gonowijuxosomezuzis.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fuau6gihfkgd23dlg8a9cvgsvg/24570136006.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/56386219306.pdfIn PDF document text
    • http://chenruichem.com/upload/files/42306029358.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/60536494520.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/47508169073.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65839055720.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/5888422771.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wibusovaxojori.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gamosepurivadesonud.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210915144445_1559851599.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/70002288411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sum+of+n+terms+formulaPDF 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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 18756 bytes
SHA-256: ef573fe6efcc046b40eae815f8d04db225aa820934e7d885a5fb501fcbe633d4
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10460 bytes
SHA-256: ab43449199efcacbbf6b2faf4807d77242bfef5e68d1d38c7f5da09bc8616033
font_02_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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