Malicious PDF — malware analysis report

Static analysis result for SHA-256 159d48e190f8efed…

MALICIOUS

PDF

85.5 KB Created: 2021-02-22 09:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ea33683ec4b62fa5dafaa7930ed21d15 SHA-1: 28399d60b6cb4d254299c9e043eb8cfcc5ca542c SHA-256: 159d48e190f8efed0e051769e4002d6a6fa109cb866ca666ec6d8c951e6f4023
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://seumenha.ru/strik?utm_term=how+much+do+foster+parents+get+paid+in+philadelphia', is presented as a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=how+much+do+foster+parents+get+paid+in+philadelphia PDF link annotation
    • https://ferijadupegol.weebly.com/uploads/1/3/4/7/134705138/2065969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ff4e08b0410b.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/zaxibodafenomawemid.pdfIn PDF document text
    • https://lewebivaduxug.weebly.com/uploads/1/3/5/3/135392118/310d66b3990f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_60317741baf3c.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/jejukigibusorutij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_602386636506d.pdfIn PDF document text
    • https://xapotaligefako.weebly.com/uploads/1/3/4/6/134612972/1302355.pdfIn PDF document text
    • http://sokolov.fun/ice_cream_cake_frosting_carvelhgtcr.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/3813658.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/dilolop.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_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 5624 bytes
SHA-256: fc302d95412a332c8e21ec156ecdb151eb23e07c486dc826b5013e23c7c67d36
font_01_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 11608 bytes
SHA-256: 9b9773e5eaaf43a8b596e49d9312d875b793b66263d4d077b6126390ee5d61d4

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