Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ca647dd4ff1a84…

MALICIOUS

PDF

67.9 KB Created: 2021-01-05 00:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 050af089f3b53ac3bdda305ddd78a5cf SHA-1: 723fb485312d267c702e9c9da5414fd26010490d SHA-256: b0ca647dd4ff1a84a9d169b6d53c91adc62a722bf2d1658b1f30b051d5bff452
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to distribute malicious content or engage in phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely for initial access via spearphishing.

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://traffking.ru/123?utm_term=nerf+dart+tag+quick+16 In PDF document text
    • https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/f5f95011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458827/normal_5fe2b5c4399f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5fe7037651124.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/5495682.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/2d5911b7.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/vuxagixil/parallel_structure_esl_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0524b334-6ea9-4559-ba52-d8f84268d799/63006549979.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/brick_kiln_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2c259b-b84e-44f6-b043-5dcdd3b45dfc/23517629629.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/54692725937.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/71321466725.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/facebook_status_bangla_app.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_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 5344 bytes
SHA-256: a8fd38c321f109778adf85f23a25a8ce2f696c43a00da63d61c7e1e881910bbd
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10716 bytes
SHA-256: e827721fe24899c5ab36f94b4e0626a0f041263d10ee7fc2da69cd01bfdc0299

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