Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5615d19898ea912…

MALICIOUS

PDF

72.3 KB Created: 2021-01-09 04:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f3194dad2da4f5c68b9d5d5d292a815e SHA-1: 20654c66aa13e94d9bf1f341dd038e8a7336bb33 SHA-256: d5615d19898ea912a0475e3dbad6ace13b0612271f6c48fc0c0c6efdf1a8961e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=security+officer+resume+summary In PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/wisufunari_ravav_wokifamik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f920a2156ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5f99aa859b9c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5ff8eee718892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418973/normal_5ff2848816dca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fe021fcdbcd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8756fdae983.pdfIn PDF document text
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/nenev-ropopegowa.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/ligalegarotawaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fb6ba36c8d54.pdfIn PDF document text
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/zawaribikasoxirowat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fa2e07fd8be4.pdfIn PDF document text
    • https://pabotori.weebly.com/uploads/1/3/1/0/131070723/655c78a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fa602d865632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5fb766a3ad9f3.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 5200 bytes
SHA-256: 782314bbbc18f17ad969107e7ba224e2e809f3a25a689c27c400b6f326d7a001
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 11024 bytes
SHA-256: 9e680b2014905cbdd0d761bed0136876dd2b79853ea0950801c3fb09a0701712

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