Malicious PDF — malware analysis report

Static analysis result for SHA-256 1410822464c43695…

MALICIOUS

PDF

65.7 KB Created: 2020-11-25 17:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 90cbc62bb4a4d48d6c9baef83f1762e9 SHA-1: 1bfecbc61d3bab161fcc25ff5a9f004e5e8ec3ca SHA-256: 1410822464c436956733efb9892f505e2f82b58654c9683d04c3791ec6078692
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 one identified as a known malicious redirector. The heuristic firings indicate this PDF is designed to link to a large number of external resources, potentially for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent.

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://traffine.ru/123?utm_term=anatomy+%2526+physiology+coloring+workbook+answers+chapter+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f8df293776f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fafd6c9e79ba.pdfIn PDF document text
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/nosix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5f9270bc58937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fa83601c18f8.pdfIn PDF document text
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/684d27b32d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fb988349b15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f8f1357ce178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fa00569ca2e4.pdfIn PDF document text
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/9910181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fbd37e8a7220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fb320c1848aa.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/3a1780.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_off0000c7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 4612 bytes
SHA-256: 30aaa30d59d9b2c537c2e9e88246c9c87c27e69f6fe54d0486d5e2ca9c7cd52b
font_01_sfnt_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 10292 bytes
SHA-256: 0fc194f1ab7898073b0f34ad76cf928e818887bde6512b5f7eb197b117326176

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