Malicious PDF — malware analysis report

Static analysis result for SHA-256 7912f1cc29a85e05…

MALICIOUS

PDF

67.6 KB Created: 2020-11-25 13:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 74a20bb6b0fe67e430a1dd4b7bd01732 SHA-1: 2832430617eb4f302815c4b86f2c22d4bd012b3f SHA-256: 7912f1cc29a85e05494c3c492fb1c839cbf6af50c477e4c4531cf4767cfc0746
214 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The document body is heavily obfuscated, but the presence of many external links suggests a phishing or SEO manipulation attempt. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=hex+beam+antenna+reviews In PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/ee41066b.pdfIn PDF document text
    • https://josazosanika.weebly.com/uploads/1/3/4/3/134339908/mudopefop-revileko-sunimusos.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/kufod.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bikotegegoxaxobeti.pdfIn PDF document text
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/zikuwavoxeritamoler.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/1409465.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/8d08ccc0-9963-4871-a45b-218489b2b99a/73083451120.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/farepijegemo.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/excel_bedingte_formatierung_ganze_zeile_einfrben.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/korean_alphabet_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/42209633553.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/jexifugom.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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 5120 bytes
SHA-256: 8cab34a6043be325b7b04ecece24cc7baecc92206a5e9e129233d42fbe0ff052
font_01_sfnt_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 11408 bytes
SHA-256: c5787808c810d670092d9110afdb50d0a706988524723225126210cea92a0d8b

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