Malicious PDF — malware analysis report

Static analysis result for SHA-256 51eaaa6d35747884…

MALICIOUS

PDF

74.5 KB Created: 2021-05-28 16:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 258d4e403fd6cc087e7c1797789c6dd9 SHA-1: 90fff96a3379626a673497effb4db889fa8983d8 SHA-256: 51eaaa6d357478842d3b8e3df096963cb0acdec8b515702d049556032f33cc54
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm designed to redirect users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The numerous embedded URLs point to a coordinated effort to host malicious content across various disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fokemale.ru/strik?utm_term=genel+kimya+1+petrucci+t%25C3%25BCrk%25C3%25A7e+pdf PDF link annotation
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/bfdaf3b0.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/kiwitanubiriba.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/xukisogidoxive-donugelaleza.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/gitikaxun-xuvizewaneze.pdfIn PDF document text
    • https://xokosawebajufad.weebly.com/uploads/1/3/0/7/130776850/d42584a295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6013e6e3139b6.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/pejikuvad.pdfIn PDF document text
    • https://juguxusomusivu.weebly.com/uploads/1/3/5/3/135327365/995337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_606af0d04add2.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/049288793d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6043790b63de0.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/naboge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_601d910b51309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_60152a77ea305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fd3c00051bb0.pdfIn PDF document text
    • https://nulenedo.weebly.com/uploads/1/3/6/0/136084055/5681a.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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 5672 bytes
SHA-256: 01c6dd332bd005a6b9d490418e03b0df0c714e2004b434f059ba8a15f86743cd
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 12204 bytes
SHA-256: 43c85e2c4d1509283767d41859ccf315b812c08c2a18a10c11ec77dfd84db780

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