Malicious PDF — malware analysis report

Static analysis result for SHA-256 5691db96a9cf82f2…

MALICIOUS

PDF

81.3 KB Created: 2021-01-09 18:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f84d12d8d3b454ba3e8b3ed8d9947081 SHA-1: 7c80c460b164aeede52385fad5b4d7b258c57327 SHA-256: 5691db96a9cf82f2421454bd8b6252796451d231dec393682094e22e309cf9dc
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on various content delivery networks, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a campaign designed to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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
  • 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://trafffi.ru/aws?utm_term=anime+tube+unlimited++ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5fa4f434dbdcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f9a31c3d62a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5fc57c3c0d4cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fcd3f8e99632.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/SQT8Ctn/63199850684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fb2963b4e50c.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/b83bf272121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_5fe780f4a0204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f884630f2255.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/e512c466-eb39-423d-9701-4bbb92414657/46797001763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833efc50-d3ce-4a6c-a9d0-edbf88426103/getasuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc43292a-928b-4294-b081-f3e551cc93c4/41905660359.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 4792 bytes
SHA-256: 5daf1ef204fcfa6f7d91b164908d7464501184521e2de5378f3264898cfbba47
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 4424 bytes
SHA-256: 879c7eb99126a644f0abd566b783ee5e9d7e5ea1ada5e24242c6d0d03e320dc4
font_02_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 11088 bytes
SHA-256: ff6c16c7b4178375325c03563c8c9f2412687d6dd267f192dd220e8416281c45
font_03_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16336 bytes
SHA-256: cb8b0c3b75634a3ac40028f3142d2b99dbff9c8bfe93654f62892c2eba89f065
font_04_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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