Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c638fb4eecdd3e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-06 18:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4099ed1f12de1e62ce29f1f6d647e755 SHA-1: 046b74e163d788c06d355c8c07b02a87b8637074 SHA-256: 43c638fb4eecdd3e0617be36c643c9be2e0f3f043fa3f15b9cffa9eac4062018
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, designed to redirect users to malicious sites. The heuristic firings indicate this PDF is a link farm intended for malicious redirection, and ClamAV detected it as a phishing trojan. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=learn+how+to+read+ekgs In PDF document text
    • https://sisezapude.weebly.com/uploads/1/3/1/3/131398367/2038604.pdfIn PDF document text
    • https://jidakizunulub.weebly.com/uploads/1/3/1/3/131381167/vujudifidatiduwize.pdfIn PDF document text
    • http://rudajudo.iblogger.org/pibomeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mebavidotum.epizy.com/25510372443.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/vugekuvibipajerafoz.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_6a4eb3d1310b487bb236df6561db62cd.pdf?index=trueIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_6ab34c06730448bf87cb332a369967a4.pdf?index=trueIn PDF document text
    • http://lonopisok.epizy.com/tepafozirikibufajew.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_59e0982618ca47a89e421045558455cb.pdf?index=trueIn PDF document text
    • http://kobizesamow.rf.gd/jupezudok.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_7f022da240b246a3b9852c1857a9fdc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/29957823220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51cfb712-fec0-4a76-abff-ef5e44b759bc/computer_program_for_freestyle_libre.pdfIn PDF document text
    • http://womiwinimubejaw.rf.gd/nuguga.pdfIn PDF document text
    • http://nijomabip.epizy.com/yamaha_ns10_vs_hs80.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/96245146819.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/42593405743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3460faa-deca-4e11-8ef9-55d2c5082bb5/nejonetexudawaz.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5152 bytes
SHA-256: c3b7b3daf0f67bcf5a5277f9988c0f286bcf911b5c4ff33bfa20c236ad1efcdf
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 10392 bytes
SHA-256: 9f912ddd4ba7d39bc5c25d87be5f558ecf8a1c50a97facde74f5b7e4aadbd91d

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