Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f38648cb2846326…

MALICIOUS

PDF

63.7 KB Created: 2020-11-13 05:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b37724acab56b6d1ca93b661a62d182a SHA-1: 1f0455a360d3c33c7c71bdf42f7a22c85384f087 SHA-256: 6f38648cb2846326322bc99a34d46a8a9629eb6b4c84924187ee8d62464f2926
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded links. One of these links, 'https://traffmen.ru/123?utm_term=camilla+bastos+de+castro', points to known malicious redirector infrastructure. The presence of a mass external PDF link farm suggests an attempt to distribute malicious content or conduct phishing operations.

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=camilla+bastos+de+castro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fa9b8ad18193.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/gobufiwosomerot.pdfIn PDF document text
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/8632572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f878cfc69caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5fa29ada440a7.pdfIn PDF document text
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/9348022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f9ca56b71a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fadf918ba826.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/f05c356571a5.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/lumixi/virgin_pulse_max_buzz_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/63453276602.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/animal_cell_culture_download.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_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 5128 bytes
SHA-256: 55b07cb5064e1c022157324e7436eec2b3c3e4dbea1d1dd64f4a93b1b9d3018e
font_01_sfnt_off0000ce66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 10712 bytes
SHA-256: c36c66a86711c6a7aa7ae80b676c70eb66f73efb4d276a742fd973c363800fb7

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