Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3ee3bb4df5f23f…

MALICIOUS

PDF

70.3 KB Created: 2020-12-16 05:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99f21ba8ca0c9c1ffb5159f1d03d9425 SHA-1: 76ee8dd42e7174baff5a255b1a142e4c0e23b184 SHA-256: 3b3ee3bb4df5f23fe0c322796ad01bdc09be3ffc763652c072634c4e129f47e4
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to harmful 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://traffmen.ru/123?utm_term=what+is+proof+of+residency+in+texas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f876621756f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8ed21c6ed15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5f9c8dfb9ce75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8f4f64e3983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f91ffeb68542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fd08f3a49d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fd17ca23666a.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/76d9db7dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5fb307b37ce68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd1e9c58d028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f891bec56355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_5fb712e9710e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5fb888f798f0a.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/1507003.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/novifamigot/railway_child_education_allowance_form_2018.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 5396 bytes
SHA-256: 84826be7f7a6f33b48432fee97fc2d0a8e6078b6e2acbfcb91cf92c8dbbe036f
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 10404 bytes
SHA-256: 7e88555c47dd0e453ed65be73987a117bb3b32e33a6ba5d7b443b5381ffa5baf

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