Malicious PDF — malware analysis report

Static analysis result for SHA-256 4054ffdd83967303…

MALICIOUS

PDF

66.7 KB Created: 2020-11-10 08:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6ee6de160c6fbfb7a04fcb32e2a7383d SHA-1: e60180c56b8b36da2cb43380cd891e2a87ce290b SHA-256: 4054ffdd8396730358a2b16dc0111775f7e2f5f52ce948cbdff4b5f15124c688
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on platforms like Weebly and Strikingly. This behavior is indicative of a link farm or a method to distribute malicious content through a network of SEO-optimized documents. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • 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://traffine.ru/aws?keyword=1920s+furniture+styles+images PDF link annotation
    • https://viledilexemapol.weebly.com/uploads/1/3/4/6/134698440/kosilonefamuzef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f9c128aedc27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fa9d05ea66cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f8cc35d17df6.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/zobesetoroso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5f9e879a97c58.pdfIn PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/5457133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f9264667f808.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/fupepukak.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/2a8f34c6-964d-4741-83d7-18aac4ee5ee6/tobigox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06d5ee5-93e0-47d9-8206-2fe76cd63378/25188523260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209b5898-67c5-42fc-a14a-9859347ca5ca/xuviwewituvuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903d2147-d9a4-40e9-84a3-063e765b643e/ruzanedanezurukot.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_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 5576 bytes
SHA-256: c27fa16bebad9733bab9876eabb61e0927c739523d792ca8276c3cb29d298576
font_01_sfnt_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 11100 bytes
SHA-256: 02ea6c43f174ce81e5aaa06e5108bf02d0b5f55efa650845f6ce7bd0aedc4737

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