Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e8b109798cda57…

MALICIOUS

PDF

66.7 KB Created: 2020-12-21 01:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 29891a50839a1eb8502f3f76552b9bc9 SHA-1: eaa59396f6b9ab2175b9bb365c8dab53a33acfdf SHA-256: 50e8b109798cda57a149187dd85800e8bf971684737bc4f52ae75a2faf9fc939
222 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=types+of+blood+group+system+pdf In PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/1458963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fc7f3bbf1ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fd5f99b11a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fd2c87b88ab4.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/86ba3aaee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_5fbf237a47278.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/6528232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5f9e72706c52f.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/81af7.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/8be3a2ca-307d-4080-bdc9-6999b8b4e17c/27695320725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c1f7e6-ba35-4294-b5b4-b03cee3a8d2a/taloneki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9110bb2c-28fc-404d-a397-f88dff0f71da/2634250900.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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 5344 bytes
SHA-256: 0d62a7684ef46fcb89f3f3113ef04aca4a3e3af11d0222ef31a9a86df496b6c9
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10156 bytes
SHA-256: 16dcde7b8d0f61beedcb6f2f64991335ec42c49b041d5e9d73f7d8f233642d73

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