Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6d4ccad844d511…

MALICIOUS

PDF

76.8 KB Created: 2021-04-11 22:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2482fb7348b4229d7e04f467757b020a SHA-1: 2137fcf7f8c6263ebf0244c8b7f50146f4f81beb SHA-256: 3e6d4ccad844d511285d570ee8cc79916aba7676f0e8faa32a6ee7564890d171
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm hosted on disposable infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=craftsman+208cc+snowblower+oil+change In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_60451228a1ead.pdfIn PDF document text
    • https://tigobatimomovo.weebly.com/uploads/1/3/2/7/132740361/xadaxas-gaxasupol-buxaxewu-lulexun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5ff7b00fc0510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_60657e4f332b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5ffe0ef479cba.pdfIn PDF document text
    • https://zazukorowoko.weebly.com/uploads/1/3/4/4/134488568/benovijafovefij_tevobisewijina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosipive/sowuzurajowazisarun.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_6f8e2a90f353463eb1287bc4e245f715.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6672d23a-ff58-499d-85bc-ba8d3e0cf257/2960244269.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/xutitewugup.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/how_much_does_a_vet_assistant_make_uk.pdfIn PDF document text
    • http://julisumuxolo.rf.gd/witemijolosunesejoxasutu.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_de5452e5950a43cdb66d027aef34f563.pdf?index=trueIn PDF document text
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_81ec1415273d4d399929ca325167346d.pdf?index=trueIn PDF document text
    • http://nunevubedodunu.rf.gd/38851258119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c8bb7e-3a18-4141-b1de-08f2e3f96d8b/57365946293.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 5900 bytes
SHA-256: c6464f3e507303645af50c34ecd437701b1dc075a403fe876c15092b76a3a6b7
font_01_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 11228 bytes
SHA-256: 7babe5b23066baf846df59286cc8330de4c29c6ed3d20a96cfcca7850fac4a0d

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