Malicious PDF — malware analysis report

Static analysis result for SHA-256 441c5357b350ab1e…

MALICIOUS

PDF

58.2 KB Created: 2020-11-17 18:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0d7d57c3fd7916543b5b223c705728c1 SHA-1: 2fc6693d77023b2ebd947873b7fbebef016b826c SHA-256: 441c5357b350ab1e9f516c32ec6e2c98a29b2e8498dc66216a2adfff30624a44
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier further indicate malicious intent. The embedded links likely serve to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=contour+outline+gauge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f86fe7f78d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fb2d2c655d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5faf49d710d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5f8db148708ec.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/jukiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fa7b56521f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f98d3c55227d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5fa082449cf2c.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/49efe283-fa33-49e7-87ad-8326449f261e/the_demon_in_the_freezer_ebook.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_off0000a914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA914 4580 bytes
SHA-256: 0be2c52a824c0e9ec8ac50023d299df276f9129299c5c15325a09d67024f8b5f
font_01_sfnt_off0000b8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B4 10728 bytes
SHA-256: beb62ca41e068d1bf56a0a5751117b48b515bbdffbaf61bddf05a67984776064

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