Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea24170f657e449c…

MALICIOUS

PDF

78.2 KB Created: 2020-12-21 11:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5d7ad29c7445249dbd6ae5bfb0d28c2 SHA-1: 141f681bf0f2d452df2c88395d3ccb92c30ae729 SHA-256: ea24170f657e449cfdfe3f31e19cb52503bf80713d70ee21d7c5be8b69be107a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, forming a link farm, with one prominent URL being traffset.ru. The document's structure and numerous embedded links suggest it is designed to redirect users to potentially malicious websites, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/wb?keyword=new%20cartoon%20movies%20out PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464862/normal_5faf5afae3423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_5f8f47fa1a132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_5fba0fa0ea03a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fe0474bb30e9.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/popoxo.pdfIn PDF document text
    • https://ruzudafuzozuxu.weebly.com/uploads/1/3/4/8/134847081/diluk.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/6e95c489a.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/pineros.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/fisit.pdfIn PDF document text
    • https://fumubesoxumus.weebly.com/uploads/1/3/4/4/134485348/bece2.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/bd831fd6-bcc5-4468-96aa-e0a214936534/widenenogepubujivetoru.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0d3d2edfcd2bda938334/1606225213832/batevivewulakem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e1dfff-ea9a-496d-8ba4-2e751ecb51d3/intermix_madison_ave_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/66835270633.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/35774421219.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_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 5032 bytes
SHA-256: 719c087f92cbd4e7ecd444e44b65cc4759a7fbfa0d106ed6c7ed56e7d80b054d
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11076 bytes
SHA-256: ef4f39ffc3aa7096a681d1aadc3db710b45f2c95c0c969f7eece2378ccb4aab7

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