Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b4ad34e39e5266…

MALICIOUS

PDF

78.9 KB Created: 2021-02-03 18:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 64a06347cc40a48b42fafa069ff2f9a1 SHA-1: 34703a10086a80d29e7d0c9d9cde89b95944b2ee SHA-256: b3b4ad34e39e52665034112c350f79d40a53a33c4bb3ced36a370b2320edfa4a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The primary URL, https://maypoin.ru/123?utm_term=zeepad+tablet+review, appears to be a lure for users interested in tablet reviews, likely to facilitate phishing or malware delivery. No scripts were extracted from this sample.

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
  • 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://maypoin.ru/123?utm_term=zeepad+tablet+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5fddb44c75e30.pdfIn PDF document text
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/04c277147723aef.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/866a09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fc9c8ef2247a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fdf91d6a66b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_6001d9eb41441.pdfIn PDF document text
    • https://kizofirelurok.weebly.com/uploads/1/3/1/6/131606598/ffab8f70.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/kewatojetu-rakubixuwukegiv-pujoruj-kezas.pdfIn PDF document text
    • https://gavititexufo.weebly.com/uploads/1/3/3/9/133997787/4d994f94bdc8ef.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/4f4fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fda6c49c6b76.pdfIn PDF document text
    • http://rollernefritmassage.xyz/watch32_movies_cinemanqei1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_60170f1de1185.pdfIn PDF document text
    • http://imedo.ru/fubibonejazixedonidisamejd8fz9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_60120e133e4ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fc75023568df.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/lomobufelozemorodopuvarxxz41.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/zigajidaxokeg-terofonigixunor-livedozav.pdfIn PDF document text
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/411da5963685548.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_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 5024 bytes
SHA-256: ac3fd8cdd6ac946d763e22aca1d8abb88ab40f8a160844c6a5fe89ddd01dff7a
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10600 bytes
SHA-256: 9919c939148ee78f5ed09bee3f8d3ff6657f36205698a47f819fccede3a27683

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