Malicious PDF — malware analysis report

Static analysis result for SHA-256 291926d51b80d0bf…

MALICIOUS

PDF

119.4 KB Created: 2021-09-19 04:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acc7b3a2f07bb0b32a8f62bad3288042 SHA-1: 16780c96d5c7a37fb091030297a01cd88bab5ba5 SHA-256: 291926d51b80d0bf2ade8c9fbd3611e9d8d63ed08a8bdd5dfed275680258893c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=julie+wright+blogger PDF link annotation
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16303880805.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210909070835.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/voninuwose.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/53553588965.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/badewiri.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/39685823185.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/sopil.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lemelufevujopegitoro.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kizoz.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/fojavokavej.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/naneputegix.pdfIn PDF document text
    • http://trevorhannant.com/dedig.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/xexepoz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161326d449ed36---fakemululelexoraz.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/jobevi.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/67014413430.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210917232238.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/5248939570.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fffb7d58---83087668465.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/fesugudewizelofax.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/sanukaregoporubixaroxozog.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/39830582744.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/webirixodokim.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/dagotexagevepom.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_off00016a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18282 10272 bytes
SHA-256: 419fcf6913aac1318ce885c3888736329eef23b00c7adae6a31fc9deabc014f9
font_02_sfnt_off000199c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199C9 20324 bytes
SHA-256: 0eb77fbbdbe8f6a8525240460eea438e1d04ac6c9d9d0193111d88a3b40805fa