Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a82ebe2a436e3…

MALICIOUS

PDF

68.9 KB Created: 2020-11-29 07:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 16501f0a88e31d89deb9e0334773131c SHA-1: e967d5e5623096f24f96d7f9e177cd70da910023 SHA-256: 651a82ebe2a436e372ee73988632bdb195700bb75b096d5fb678167b75a86b14
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=one+block+wonder+with+panels In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5fbf940b72d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5f9ec7eabc858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f9ada65c0c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5f9ba8fc3a836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f88407fc05cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_5fa7da76ef81a.pdfIn PDF document text
    • https://kepupumi.weebly.com/uploads/1/3/4/6/134616340/73adc5354c89c.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/01cd9fe6e.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/1741697e-2e2d-4c70-be5b-837a72ffdcb6/dapujubupawo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/56783630862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6588301-1f09-444d-8c59-738513126f6a/bovosepotosekitumep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2884cdbc-d370-4791-9123-371ab7c43591/fegibilaxiwoladedula.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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 5484 bytes
SHA-256: ffd21aa75e44c341148696315452b64e78dc8bf30ba425a66dba23aac24447b6
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10964 bytes
SHA-256: a08177fee1acaa5f901f679d29ff953c3f92af694eea8b9d23257e085c853057

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