Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a525b69533317b6…

MALICIOUS

PDF

68.5 KB Created: 2021-02-05 23:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 73ae9460b916d814c78f129c0b596dbe SHA-1: a9134103e2784f3ee2f00b0cba73e5e745994a51 SHA-256: 5a525b69533317b6602eb79231883825a0f1e7b87db812b4af5ed58e242a9ff9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM specifically indicates the presence of a mass external PDF link farm, with one identified URL being http://xetulugesoboko.epizy.com/rowififezigokof.pdf. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect the user to malicious content.

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://jacksth.ru/123?utm_term=oasis+bible+tours+getty+villa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f95d3c049.pdfIn PDF document text
    • https://zugudomumomaxix.weebly.com/uploads/1/3/5/3/135324912/6470087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489244/normal_5ffd444bb5fe9.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/8d039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fcb11be6f5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_6009e9844deb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_600896396b361.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/free_birthday_invitations_templates_online.pdfIn PDF document text
    • http://vivofuma.66ghz.com/38933968410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fc866a6c997d.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/lotifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5fce0b5e0b628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5ffdf133728e6.pdfIn PDF document text
    • http://paganel.world/100_tamil_movie_free_tamilrockers_20194jnho.pdfIn PDF document text
    • http://kukuginori.22web.org/zugadazugifux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetulugesoboko.epizy.com/rowififezigokof.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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 5184 bytes
SHA-256: be1be3c7443347517b13e887278a9c47f471657d0961fdabcb47877dc0faa81d
font_01_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10492 bytes
SHA-256: 73f4312f6f5dcb35fc011a563c58f5e88f5d066944c7b13cd2e2b74218374dfe

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