Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d6d7dadef5bd14…

MALICIOUS

PDF

62.4 KB Created: 2020-11-19 15:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0c6dd21894dbe944f5e255da8da2fd56 SHA-1: 1783d4480bfa7837a18858f9be07470299e1deea SHA-256: b4d6d7dadef5bd14d2dac3f9e256fe96b13a9efb35150b49112f63017097ecab
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links directs to a known malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=minerals+that+contain+combinations+of+carbon+and+oxygen In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_5fab569bef483.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/kusig.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/643ae58d41053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9d1d02b7639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_5fb2afefb6bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_5fae89b9ae2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f9728fa840a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5faf5592bd875.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/96a04b89-ec44-4794-ae68-316deecfa614/secondary_math_1_module_4_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54644563-2357-4986-a65a-8f19f6dc80d5/86042210595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563bb656-57c9-478a-90f8-ab117c03f165/18223369545.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/wam_wave_model.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/suderoxozal.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 5748 bytes
SHA-256: 02f3ed7784334551f0bce41f9abd9f2d3038da90cfb08a9cf66c782bc7f1145a
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 10048 bytes
SHA-256: f3e3b845784b836964369cf30bc124ca75f87d3293c99beb0d90293a6489317f

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