Malicious PDF — malware analysis report

Static analysis result for SHA-256 288fa8a393aecea3…

MALICIOUS

PDF

58.1 KB Created: 2020-12-04 23:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 686edfe04d87e6f04e590108bcacb664 SHA-1: 724a4c748948f5b170c42f1449406c9145dfc60e SHA-256: 288fa8a393aecea3a4067caaafa28f0ecfa6b76c29639c4d514105894fd3602a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?utm_term=lagu+aliff+aziz+kalau+cinta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5fbbd7116aa5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5fb4368670c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f8d55140f33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fb46dd74960d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5f8f7f5c5c4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8bf7d87bed2.pdfIn PDF document text
    • https://rekeboko.weebly.com/uploads/1/3/4/8/134899800/6abd33903c306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f9c96d2430e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fa1c8e14d0c9.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/939983.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/86426dd4ab.pdfIn PDF document text
    • https://rinefoza.weebly.com/uploads/1/3/4/8/134883618/4f4c0d4fd79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5fa52e12da0fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473388/normal_5fc4aeb3dd325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1583bff13940aa242bd98/t/5fc31b10a97599144e5e1fbc/1606621968580/21041489820.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6cb2f3de5e49b55cfb10/1606380723074/miwifoxosalijavenusazibo.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_off0000aabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABD 4828 bytes
SHA-256: d1d2553113629f4f8df63223b358b0f130a44ba4d601b6d7d76ec854ca8d7773
font_01_sfnt_off0000bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 9456 bytes
SHA-256: 4116b7d030f0d967ec07c8d2adec7c7e91c67e9db0b7b5cd4523e56c4d02fb42

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