Malicious PDF — malware analysis report

Static analysis result for SHA-256 f233fd785cd2a004…

MALICIOUS

PDF

76.5 KB Created: 2020-12-28 08:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a758a4e8838a914de96d78b62b93c69e SHA-1: da033157e7a1d26ac11059e4b18e9d2df530ab8c SHA-256: f233fd785cd2a0042682b2834609d96faeaf78e6f23cf037522a5790b531e7d7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the presence of embedded URLs and the PDF structure suggest an attempt to redirect users 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
  • 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://ggtraff.ru/123?utm_term=ensouled+head+prayer+guide In PDF document text
    • https://cdn.sqhk.co/gujadozede/jjejdy5/98084891449.pdfIn PDF document text
    • https://diritirafimiwav.weebly.com/uploads/1/3/4/3/134376035/jaxesipekiji-sosum-mitivavila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fc035609f0fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_5fb2e1df415aa.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/haMvEjh/pedokoxasazupekugit.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/gQihPeP/rifapogini.pdfIn PDF document text
    • https://fimibiwuru.weebly.com/uploads/1/3/2/6/132696060/19ad6b.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/bavinasebuwiwijoporo.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/935e5620fcabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5f9aa292ae3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fd09ec3f0259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_5fdc39bf36342.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/tgeQmUV/nubababiselubisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fca34ea-7727-4351-9751-92e282f46c2d/dojapunoroxemefel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bd555a-bcd8-470d-a4f9-e18de651a64a/91913882935.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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5280 bytes
SHA-256: d4f73ce9bcfac40a0365739538776fe36803b05d04fddeca05679d73359e6dbd
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 10696 bytes
SHA-256: 27e63b07acb12f29db63944c804c4fbec940148fa76766a6954ed3278d7421f9

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