Malicious PDF — malware analysis report

Static analysis result for SHA-256 483325c4b79a8dfc…

MALICIOUS

PDF

77.1 KB Created: 2021-02-19 19:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5b54549753e5e43f5546321d0b555a94 SHA-1: 5f61d147c4ff0beab6b900b58e180a1839b24d94 SHA-256: 483325c4b79a8dfc2234ab245671034291e022df4f16b1823bd80d830d723907
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/strik?utm_term=geronimo+stilton+tv+series'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect the user to a malicious site, potentially leveraging JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=geronimo+stilton+tv+series In PDF document text
    • https://cdn.sqhk.co/nixivezez/xjcUSgc/makoxikeretujuxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ff68d1b49af1.pdfIn PDF document text
    • http://big-ita.space/29043122376re159.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/ifE43gh/tumblr_quotes_about_change.pdfIn PDF document text
    • http://czecheducation.space/dufaxilgda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5fdf55137cafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fdc4b1054602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fefcfe739fcd.pdfIn PDF document text
    • http://triple-doska6.club/zezenigabavokuxiwasuxfi2u5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fec20cbcca87.pdfIn PDF document text
    • http://hq-cleartv.info/mozavokelokavirubirus6x0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5ff623abb8582.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/temujonuwu/hoi4_fuhrerreich_uk_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/broomfield_police_accident_reports.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_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 4712 bytes
SHA-256: 15eac50c7c813f32db5ad379d671380a3f5fc295ed975c6022e7267d94fcda7f
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 11004 bytes
SHA-256: 1ecb0a7a98f2424f10d7bbe659b39aede7ff3a0b74b0fc889104e34b1d232c67

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