Malicious PDF — malware analysis report

Static analysis result for SHA-256 c596ef73ee28380a…

MALICIOUS

PDF

74.3 KB Created: 2021-02-17 19:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09da8155f0a5825a051d99b97edffc7a SHA-1: d29e975ee27146db8705c2b50d8d51b021fa49bf SHA-256: c596ef73ee28380af16972fc18852b81c361bba25ab4020078c688478a16fb64
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted content. The embedded URLs suggest a link farm strategy to potentially manipulate search engine results or distribute malware.

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://bologen.ru/123?utm_term=bram+stoker+dracula+quotes+with+page+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fe908c656882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_6025e74d62ffa.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/igfkphc/parents_as_first_teachers_program.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_601612c475b6f.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/idicKwY/37229747616.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/cie1heM/naxej.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/vomexotazudaxi-mewofenasopu-risarinatij-dodefaxesutalej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_6026ecd58206d.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/20999a647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601563cca7386.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/un36Xhf/88708294524.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/844jif5/67009785223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376609/normal_6005f0f570bb5.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/HehjjhR/51810987354.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/iMXhh3d/vr_warszawa_dla_dzieci_wakacje_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonanelokuweje.rf.gd/15013638533.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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5960 bytes
SHA-256: 890a1712f12d0851eb87f93093dcd8c77d5d248022345a690257ed40b65d294b
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 10488 bytes
SHA-256: 4760b9fb5a9e8b8e159b89a27e74f8670fb3d7c46ce76954183da961633ffa25

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