Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a586e186894324…

MALICIOUS

PDF

74.8 KB Created: 2021-02-26 04:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 07f7cf3008db020d38b0429241e1327e SHA-1: 142002412a274d1ab80b0bfd4b7eeed2c82274df SHA-256: b6a586e186894324be47f3dfd5797162a1fc55d33bf843f7ed3712a6d548e005
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The PDF contains a large number of embedded links, many pointing to external resources, suggesting a link farm or phishing attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious sites.

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://yafferge.ru/123?utm_term=what+is+in+dunkin+donuts+power+sandwich In PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/nutegosomoso-bokikuxuto-fuxidezoj.pdfIn PDF document text
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/8931e2e4a19e10.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/mupurutovuj.pdfIn PDF document text
    • http://losmopaka.site/entreprise_alternance_informatique_toulousegd4p0.pdfIn PDF document text
    • https://xiridibokolu.weebly.com/uploads/1/3/1/3/131379099/7798faacaf5b.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/d34e776bd1a6f81.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/casio_outgear_sgw-100-2b_twin_sensor.pdfIn PDF document text
    • https://witukuvufun.weebly.com/uploads/1/3/4/8/134895732/3612893.pdfIn PDF document text
    • https://soxuwewoduxewu.weebly.com/uploads/1/3/4/0/134042667/piwufoxiwexeg.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/dusubonifu/17182995244.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/34310436651.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/mofokulopuzetajur.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/parallel_circuit_and_series_circuit_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/other_stories_size_guide_jeans.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/ammi_ammi_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/tileja.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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 5296 bytes
SHA-256: 780cc7cdcdb094776bacd916fae4ee38e56a47ecbdf1bd515270f002224bbc6b
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10856 bytes
SHA-256: ed1b1c34d3528c6b1d02668e8a807048c747c1d211b64399bc41f0025505f992

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