Malicious PDF — malware analysis report

Static analysis result for SHA-256 186a1f3afd8a21a1…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 03:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0cbf1e1c73d9f9a93c9fa9d3f3c48e69 SHA-1: c95db26f1c81f6c3c487effe57e870ca2e60d1a4 SHA-256: 186a1f3afd8a21a1154a127bade85288210d64152f84ff1f2f9d6f4a4d22cb6c
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, including one pointing to known malicious redirector infrastructure at `https://dafemum.ru/award?keyword=brassage+de+l+information+g%25C3%25A9n%25C3%25A9tique+pdf`. The document body, though heavily obfuscated, suggests a lure related to genetic information, likely to trick users into visiting the linked sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/award?keyword=brassage+de+l+information+g%25C3%25A9n%25C3%25A9tique+pdf In PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/zinazuwulomagamid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fe9505f6b96a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5fde86e7cd7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_6011e3d3e0897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_604f65877296f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_604727205bec8.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/b3830a83eddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_604fe1601492a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fdd324f5dc5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_1dbb32ee3e004fc5aeaf2ec39338394c.pdf?index=trueIn PDF document text
    • http://mufifofoge.epizy.com/winkawaks_with_all_roms.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_f1e1213cf5c54c67b00e26a53aeca82f.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_d9b91cf96f2841d388a45fb87dfd5f6f.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d4987b44cc484491a2441f47dc62c8f7.pdf?index=trueIn PDF document text
    • http://bamoxogoxufoge.epizy.com/61317497231.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_86e8a45444ef456faf51cf6f5b2da27d.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3cf1013c9e374149a8a4e50a5f973733.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_5ca422a1ebf041efbe7145a82ec4b1b2.pdf?index=trueIn PDF document text
    • http://sugajuze.epizy.com/52930505189.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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 5676 bytes
SHA-256: 453f58d5de0d7c57816640f883f6f9b29cf33f7ba203a88d119e202721f4b54f
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 12104 bytes
SHA-256: 5dc5294b10239609e493e1802cbe4955e1d2a7924971bcad7a1762b1c117277d