Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ccef28e8f71d14…

MALICIOUS

PDF

71.0 KB Created: 2021-02-24 01:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2d3821eb74e5698b0aabc017bc5b3d29 SHA-1: 24a18c6053d22a52716184c791393c3f216f615e SHA-256: 53ccef28e8f71d14ea7664235054aac029657c23539b66de7ba10f4619a351e2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain a question designed to lure the user into clicking these links. The heuristic firings strongly indicate malicious redirection and a link farm, suggesting the primary purpose is to direct users to potentially harmful websites.

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://yafferge.ru/strik?utm_term=where+is+1+police+plaza+located In PDF document text
    • http://wowunoli.22web.org/comment_apprendre__parler_le_franais.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_60229f39b142d.pdfIn PDF document text
    • http://zesibedi.22web.org/fuvelonikoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fdfbdff6dc17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fcebd3373d39.pdfIn PDF document text
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/1c7f8a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5fd6752076fba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5fc6925d5c2a9.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/whhjfjh/97153475390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fde395970b46.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/5959317.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/agC74gg/62272232791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5ff83acebbfee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5fddb63e1d773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 5276 bytes
SHA-256: 3d0e9074c7123a074af4f7d48f1ce160711bb20611b0d3972a74e102af4aa9f7
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 11744 bytes
SHA-256: 224b7b0590eee9c3d5d35e797b5fcc5e75697caf5c6df0df8307a99a810cc46b

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