Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29c66b13dee1142…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 04:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6967d83804bdd99dffb97b408f9d751 SHA-1: 1e0ba02396a8a4889c5b4e38b61059bfd13c7c15 SHA-256: e29c66b13dee1142bf4b9d4563887fbc8d6a8f96f4d09aed1f2ba49ebdbca686
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used in SEO link farms to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites, masquerading as legitimate content like worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=missing+numbers+worksheets+for+kindergarten+pdf
    • https://jadivamanug.weebly.com/uploads/1/3/4/8/134868371/7836034.pdf
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6015c3393313d.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_6059ea4fba9db.pdf
    • https://cdn-cms.f-static.net/uploads/4503533/normal_606ccb02b5049.pdf
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6061c4dd1b56d.pdf
    • https://cdn-cms.f-static.net/uploads/4383445/normal_605bc78f10b93.pdf
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/wimijesutu.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/1712899.pdf
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/tafel_sibepobolinim_mirozisojitam_mimoxowepar.pdf
    • https://static.s123-cdn-static.com/uploads/4403823/normal_5ff4915f2d5b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/divikufifir/naxub.pdf
    • https://s3.amazonaws.com/webipejonavuv/ms_project_free_learning.pdf
    • https://s3.amazonaws.com/fomudebipefasu/66775369852.pdf
    • https://uploads.strikinglycdn.com/files/be1e6e9e-0296-472c-a49d-3fe626c4d5ce/nuwutopa.pdf
    • https://s3.amazonaws.com/tinivukedeta/18867922002.pdf
    • https://s3.amazonaws.com/tonisefoteka/cartooning_philosophy_and_practice.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/27046045474.pdf
    • https://s3.amazonaws.com/fizup/button_color_change_on_click_in_android.pdf
    • https://uploads.strikinglycdn.com/files/9a7c2bd9-a135-4eba-9183-51d796a8cbf3/what_is_the_average_salary_of_a_resident_doctor.pdf
    • https://s3.amazonaws.com/tugafebip/guzedilulufipegado.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b6.bin
97b47b53cc984f1cf5912f5c025001e77ee53405cbf77f7036f8611da4315ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 5724 bytes
font_01_sfnt_off0000f821.bin
0bba4d6121641dd61a14a841616f0b8e273bca28d5ac392f1d3ee47593a87a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 11800 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.