Malicious PDF — malware analysis report

Static analysis result for SHA-256 a596da020e071a27…

MALICIOUS

PDF

85.7 KB Created: 2020-11-18 20:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2610319514279fb3770e281a1c041bb5 SHA-1: 87b28af5dbc701237797bc3ea3667156f86bb74e SHA-256: a596da020e071a27f2b55429e5153d0fa5fbabddf4900480b7d0132c71c65105
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, a technique often used in phishing or to redirect users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to a known malicious redirector, and PDF_SEO_LINK_FARM indicates a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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 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.
  • 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://traffking.ru/strik?utm_term=furniture+company+introduction+lette In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_5fabee446855f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5faf0c1f455af.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/a6b7e60f65dbec9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e632f50-61db-4946-be03-77da2f55d318/87261123112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeae26cd-190a-48e7-b25a-1cf2c792827e/34661483761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e059b0f-b808-4105-9190-51ca5c56945d/wudenagurixavavopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7762be-1244-43ba-bb98-8cfa6cb31d6b/58599561262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b5c4ac-8758-4db4-8ccd-0a07db04687f/dulfy_mursaat_token.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153b8c11-d140-46ca-bda6-ff1850a486df/88317394910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e43df7-00d8-4889-ad68-4e9c55a023b6/kagodokokaninapibevelotup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16523d15-cd8a-4c6c-90ec-19779072efa4/96481754836.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_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 5100 bytes
SHA-256: 61773db20877387cc6362140dd9bd8fdec23715d834ed95d52421c02555b22aa
font_01_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 11636 bytes
SHA-256: f0509d43d8588ba3c878dd2cafbd01210e1b915e1c8964471fe9d5d9c025b621

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