Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf5875b5fc8980d…

MALICIOUS

PDF

71.6 KB Created: 2020-12-21 07:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1ccd3b76ff0b700b8bb948e19a9dd806 SHA-1: 938f202408c583e48391b612ed68b643e6fe8716 SHA-256: 4bf5875b5fc8980daab0f590f1ecd9b9d968d51a8525730ea9cfb8c203213eab
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosted on Weebly and other platforms, forming a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

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://ggtraff.ru/strik?utm_term=talking+giraffe+text In PDF document text
    • https://xopapukewude.weebly.com/uploads/1/3/1/4/131408664/a44ede.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/jatuxeta.pdfIn PDF document text
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/2995889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5fd7a76f39c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f8e3469486d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fad9f4de9b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_5fda55e75b97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd92d332ea0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f89082b31e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f99f8ed8471f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fc2ddd72bfd3.pdfIn PDF document text
    • https://purowuma.weebly.com/uploads/1/3/4/4/134472698/pugala-xadiwazor-sevavag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f9ba84c0a743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fb679659266a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc56d23ff13940aa25df82f/t/5fc8e589ef56e05e5faa4c46/1607001482664/maquis_board_game_pnp.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 4516 bytes
SHA-256: c8cb0bb5f99a022d6130b89d24c73b9121ef1f2d84ceaa5a761c37ad83f931be
font_01_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 10536 bytes
SHA-256: 34db9d24799a245396ffa6a59d800817f46dda19bc77796e8f29e18de44e1849
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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