Malicious PDF — malware analysis report

Static analysis result for SHA-256 27085918a8a32ee4…

MALICIOUS

PDF

67.5 KB Created: 2020-11-23 18:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9f3023e85a17d60bf7b33ee65a8ff903 SHA-1: 54235ca5a2b9910c4c449fd81f4ebe6f15aa00ed SHA-256: 27085918a8a32ee4c8e965df8ccc8919057ad1675cad5fcfec53225e9499ea7d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document is designed to lure users to external, potentially harmful sites. While no scripts were extracted, the presence of malicious links is sufficient evidence for a phishing attack pattern.

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://traffmen.ru/123?utm_term=rv+ceiling+fan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_5fb405b01d48e.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/7189206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5f96ea83aff73.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://rafopotoze.weebly.com/uploads/1/3/4/6/134609035/1c83a9e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5fad78dde56e0.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/059cabea-edf8-4851-963e-0c4641b69835/ahlak_geliimi_kpss_sorular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06eed6ca-9133-4425-bd76-1b18e66a159b/nubugizesebomegoxexifuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37adad4d-8d46-468d-abc0-3b17f69a41e9/45615685392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b5867a-9163-4474-a468-02660ae8cd97/41196119083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc17ff20-50a9-4922-98b6-f01bb824304b/64075625064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc7a20d-c84f-4513-a86c-1e320a6a6436/maze_runner_newt_book.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_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 4844 bytes
SHA-256: 43e1583df826db5f7631b125a496efee2cb6de2b9c56c47dc0a31f616977c789
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10824 bytes
SHA-256: b98f651eee1ce83dfc748caf2b60a3aa0b4fe331ed9083ae5700e1c52ccd0450

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