Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b82519e728b082d…

MALICIOUS

PDF

66.5 KB Created: 2021-03-19 22:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 765b6a36ea6c8075cf2bae09410f3c66 SHA-1: 5ea3e0808ba0ef84ae0746eba997468d4895c11f SHA-256: 4b82519e728b082dba9ba92d4744147bd94c4a9a522045915a8abcb920d5a3b6
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 pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URL `https://mezovuduw.ru/wix?keyword=aldor+rep+farm+guide` is likely the primary lure, directing users to a malicious site. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=aldor+rep+farm+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384037/normal_601d2ac255586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5fe59406c243b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5ff5f72b8d2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6044a02409c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_601cee271cedd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_600954e15ed60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6050da1466230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_5fd99bbe56d54.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/Zgejfid/9011085177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_605122c066541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_6005b5459f79c.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/Hjheqia/32999208442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493198/normal_5ff6000d2e6a0.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/ehhoaib/antivirus_for_windows_10_free_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_601231cb6d2f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_11b523b7bb274df29965067223934273.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_198ca9125c4f4f088e9b8b3efb4131cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/forsaken_dream_theater_piano_sheet_music.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_9628835b22ce4b1aaed45f39d4c9b240.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/jazikatosetinepapusanite.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/futokajobedi.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_ae6056de64d049cfb7dd3e085ea52bc4.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_af455159c7e84496848ae1071b3f1f0e.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_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 5172 bytes
SHA-256: 9137b60096876dbc1d0d1f7c5c95d1f40abfd3a47f253ee214cbb5777f695c7f
font_01_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 10280 bytes
SHA-256: e7abdab9b0d41a8be6d3a7c572f530153e2b2de26e766d63fa9b924ae4650748