Malicious PDF — malware analysis report

Static analysis result for SHA-256 e997873431d238ea…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 14:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9e6ccb9ab409bcc0f27c1d5dd27c15b SHA-1: def614cdf2a8347e639ec1fb8d657422b8ce477b SHA-256: e997873431d238ea6bbfdf8aa02b02a0e33168a449392a3a60b405d4292d4f98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy to distribute content or traffic through numerous small, disposable links. While no scripts were explicitly extracted, the presence of external links and the phishing detection strongly suggest a phishing or malware distribution attack pattern.

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://transturist.ba/ckeditor/ckfinder/files/files/xazemaxiziwogarexi.pdf In PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/44278385316.pdfIn PDF document text
    • https://projetovm.com/uploads/files/gulomebidugezopizivaderun.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/14924665753.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/tagenoj.pdfIn PDF document text
    • http://blgjad.com/upload/files/kikasasijevizibotuv.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tadalogeluwano.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3c89982d479ad9e0a89793bdcf98e46a/pikosiluli.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/98291317323.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/16868965245.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/35934851926.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/70887913361.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/medemawutamasuv.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/galugasisamuwe.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/77318748194.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/gilanokamunabozupogulatek.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gusax.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/30012b196617f50bda577b77714b18ac/76351081664.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/19662132712.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/19027935123.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/35621175413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=virtual+sex+game+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_off0000acc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 15468 bytes
SHA-256: 9cc5b0ff580792c36a574079a361378aa02b7f1b5ac7ae71ab6e1cacb17f00d0
font_02_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 10760 bytes
SHA-256: 2007622949e65e3ab3753c0a7c7b1a03df7ba11af66a5179b9e98155185a42ef