Malicious PDF — malware analysis report

Static analysis result for SHA-256 8927403caef13f0f…

MALICIOUS

PDF

93.4 KB Created: 2021-09-10 05:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 745b3df2716378733e859f43ec4bb0fe SHA-1: d727ed080f03dff2d8d6aeb7b55ca084823391ed SHA-256: 8927403caef13f0f817c51daceb143560c64858880f8d2ec09af08ce23eb5484
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, with a high concentration of links on disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ganganagardentist.com/userfiles/file/50865099545.pdf In PDF document text
    • https://ewastexperts.com/userfiles/files/61368054904.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/dorinedafodasotomiro.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/21404941086.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/87a76e6fc9f909325409156f5c4d4db2/44183262234.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/93495808673.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/3338131140.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/banopezozokires.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/volubawiloli.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5q07oeicibrl6ns64iubmuo0m6/wugizoro.pdfIn PDF document text
    • https://cargobull.cz/res/file/fopipivuzuzege.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/vebumiw.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/57863581925.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/1866331160.pdfIn PDF document text
    • http://e-menu.hu/editor_up/zomaxopode.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/53649791813.pdfIn PDF document text
    • https://eternalbliss.net/file/rejuzorogawub.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vosarisonokugopajojud.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/73404434819.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/96978057922.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/49037478159.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/34998940385.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/62740432680.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/70244556201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=oh+no+roblox+idPDF 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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 21616 bytes
SHA-256: 338a63b254b4f51cd56a821982468dfb3f26f596a54ff0e34c4a4c8775da4f97
font_01_sfnt_off000139c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 10052 bytes
SHA-256: 4e31cfa4d30ebb00e698711149cf2a28a3054130a0ccc0f7904fccd237d41d86
font_02_sfnt_off00014fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1