Malicious PDF — malware analysis report

Static analysis result for SHA-256 f305962141beb819…

MALICIOUS

PDF

65.4 KB Created: 2020-11-21 06:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 69ed8cf3bbeb3452a49822ae19fd3723 SHA-1: 531e3bbe3357a2034b011ca16bd36da44f3e0e43 SHA-256: f305962141beb8196d952b910a841547cdc1bf992ee128c13bf14085b4586355
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it's a redirector link pointing to 'https://traffking.ru/aws?utm_term=checkbox+listener+java+android'. Another critical heuristic identified a PDF link farm with 24 external links, suggesting a broad distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or 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 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/aws?utm_term=checkbox+listener+java+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5f9b0d091d65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_5fa4a01729ea4.pdfIn PDF document text
    • https://kifewuwumezoduk.weebly.com/uploads/1/3/4/7/134740170/vuzopipedefope.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/zobuwubedak/xijiki.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/metformin_500_mg_tablet_online.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/99188185160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ef56b1-eccc-416b-b29a-9bc85bbb616d/rikusuzomevejaj.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/37309013108.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/blender_tutorial_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/lemud.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/62666887776.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/minecraft_games_unblocked_online.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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 5340 bytes
SHA-256: 6c5f19c8afd18d69002d70769a462143cda2e24aaba2d44b1cb16a90fc7e62b2
font_01_sfnt_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 11268 bytes
SHA-256: a0f20bdcdf741b39a98ec40e2a5209542bc2979fe4f77f7cdae482406e376984

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