Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b91e4ba0f1327f5…

MALICIOUS

PDF

73.1 KB Created: 2021-01-12 14:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84eaff35a329d8b26290e6ef6a17704c SHA-1: 4cd151b9ee5d44ad81872d3cc747c0846d5c891b SHA-256: 2b91e4ba0f1327f53a3e6797a74cf13517bf54a472b4ae5397bbfae9ede8bd5e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to academic formatting. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=adding+appendix+in+apa+format In PDF document text
    • https://static.s123-cdn-static.com/uploads/4458428/normal_5fe01f96e5dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5ff5702583be2.pdfIn PDF document text
    • https://miwebakoz.weebly.com/uploads/1/3/4/8/134862152/1653352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9aba55b895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fcacafd39791.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/1fjSifO/zebodobanex.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/5060962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fed267c3abdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409607/normal_5ff0dfa066f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f9476c3c8369.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/iahewjb/cadex_medication_reminder_medical_alert_watch.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/nolarifaforuxop/fukedelebuvejegatirokij.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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 5208 bytes
SHA-256: 9b54cd7aeb54ef3dc10380bd94923c0e319fefc0f63b35be5b897cebd00da250
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10408 bytes
SHA-256: 9a9a0a354d293fac73cdfcf7444a3234916d6420823573d5f2544c4eadec20e0

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