Malicious PDF — malware analysis report

Static analysis result for SHA-256 9831d25618bcae5b…

MALICIOUS

PDF

77.9 KB Created: 2021-01-01 18:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 86a95ef1daa5dd83b3959cb66800bb08 SHA-1: 9ac453fdd395b54f71d70f463c5b1c6a272feb8a SHA-256: 9831d25618bcae5b5f98028724f0476e47e33ce8a2f54fab02ba0477ab6a86f2
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 numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a harmful destination.

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://ggtraff.ru/strik?utm_term=merge+dragons+event+cheats+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9d71d387d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fe9eeb46a9e6.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/icjwluE/darkest_winter_last_survivor.pdfIn PDF document text
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/2097349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5fe057475d235.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/0a9431d9-c00e-489b-99cc-61b1d0bf5549/judy_blume_forever.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/89762532270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c56291-214a-440a-b69e-2d645ee1b086/michael_vey_7_the_final_spark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2e7498-b346-4804-95d6-d786d702a3fe/ejercicios_de_potencial_electrico_re.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04dc745-a05d-4b21-adeb-a326b924ab3b/sebiwusifober.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1126c9b3-a0d8-4871-925c-13a38d112425/61877097792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e517778c-f327-47a3-8a96-60555e155a35/tapit.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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 5508 bytes
SHA-256: 84f05c8d05aafa3e9123dce6123e21d9e603fbe74d0ea26fb2118a827cda3be4
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 12432 bytes
SHA-256: 935bcecac0789e372b28a9b35d73758f428ce612b9bf38468cc4740b1d6cb524

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