Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5526a106b104978…

MALICIOUS

PDF

99.6 KB Created: 2021-03-19 04:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a361802175dd8b34e224a7f5b9720f4 SHA-1: 6949ec1ec4b43cc7573b1aa0fede981ea3d5dead SHA-256: b5526a106b104978d9a89946480ac2e1ec0af020d6d71734ddadb3dc2d70c213
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated and appears to be junk data, but the presence of embedded URLs and the heuristic findings point towards a phishing or malicious redirection scheme.

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
  • 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://mezovuduw.ru/strik?utm_term=lopi+wood+stove+parts+blower PDF link annotation
    • https://tozirodewekopax.weebly.com/uploads/1/3/1/4/131453541/d638ec9b6995f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5fe0eefc83289.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/lufigegowasumanuxaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_60293e307403b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fd852ce6dbfc.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/luwiloze-bidoxovevixogu-midoripazemilaw-mixudaxevofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_a30b83a4358f4e67a4c48c4aa6217435.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_94f84cde29d3412bb01fcfd5430d25e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pomaxa/xogakibab.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_9817ffe86d5e455fb6f56b38242bc03a.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_4d25857b7e464ba08c91f704a7b94b8b.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_baa8e229a78f443bbe230cbb34159e34.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_b4f7952a900c4e2f8f02c89d294a9f54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb4fc3c-449f-4f4a-834f-afbd4929dabf/mipubekufubukakulosa.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_10427fc4aedb4e50abbd82a3dfc8619d.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_4e423bfa95ab4835855f6a6bc1b59001.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/texas_instruments_ti-83_plus_graphing_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d75656-62d9-4861-aba1-83a6d23298c3/jezopajufox.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_b22cb58b3adb4c378f0d99eec8971f39.pdf?index=trueIn 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_off00014885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 5184 bytes
SHA-256: ed07ca0174e9e9923136f4701203bc4a541fd0197d36f264cc35103f911e9c6a
font_01_sfnt_off00015a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4C 11464 bytes
SHA-256: a3a7668aee1d4912ca018c1c6c75084d15d58126664eab6892afff4e7480101a