Malicious PDF — malware analysis report

Static analysis result for SHA-256 6285bf8ad103a773…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 06:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2b95eb2056516baee6e26af79699924 SHA-1: ced23fae721a222143f0ab5337376781c71ca73a SHA-256: 6285bf8ad103a773e6a0c74349532dedc629cd93d05dd1b922a9c92dbe29e248
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 link farm with numerous external URLs, including one pointing to 'resalured.ru', suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to wiring diagrams, likely to trick users into visiting the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=120v+intermatic+timer+wiring+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481518/normal_60077073ef361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_601b9ce1efcc2.pdfIn PDF document text
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/ea571.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5ffbf54d017ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ff496bb91e28.pdfIn PDF document text
    • https://pagebuso.weebly.com/uploads/1/3/5/9/135972497/9db575895fa1a9.pdfIn PDF document text
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/xisimimazuxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60324d3d5e3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6036ba23e1d03.pdfIn PDF document text
    • https://potutipuvo.weebly.com/uploads/1/3/4/6/134680823/7142267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_954a5986415546f08fe6c9356cecb2d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/folder_dividers_template.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_aed90212dbad4ba2832b98f8c70596b7.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_c8780ada22304fbcbf48f6a801155287.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_3082aa69e0bc4f10b98a5cf70bab19e6.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_09d225a6def4450b8094e2ad43e0d2cc.pdf?index=trueIn PDF document text
    • https://b6b48848-b4e5-45fa-8615-5078b9c10b0e.filesusr.com/ugd/94e5ef_081f2bfd630d45d89d5a7a795bec5490.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_32fe78f107414737834f789b2f638291.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/accounting_format_excel_shortcut.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_af78751d22c54d58bac7f3456ab649bb.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5432 bytes
SHA-256: b2585449969b19225e2ebac75e9b0aaeee32aacf969427e9450745545b486606
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 11360 bytes
SHA-256: 8d3990a186174832e4d2d16cf995b2585ff049d3723fc5e0535fa807b633ece7