Malicious PDF — malware analysis report

Static analysis result for SHA-256 2654b0b3c2ebda79…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 11:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 6834edc51d5eabad364bd712be57b239 SHA-1: 2f15de8d869090925da358bfcc8bdeb3a4a0312f SHA-256: 2654b0b3c2ebda7964ea6fcb3f06e27e3acfe8cb8281e3d0d022f91489368b8f
186 Risk Score

Malware Insights

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

This PDF file is identified 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 a suspicious one hosted on 'nipisod.ru', suggesting it's designed to redirect users to potentially harmful sites. The document body, though truncated, contains metadata related to its generation, and the presence of embedded URLs points towards a phishing or malware distribution scheme.

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://nipisod.ru/strik?utm_term=when+you+wish+upon+a+star+piano+sheet+music+musescore PDF link annotation
    • https://cdn.sqhk.co/tovitaxani/gZEcbyD/3756554944.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/fnFnAey/11932462458.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/Vx7hjnu/ez_loader_trailer_parts_by_vin.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/ff5c819b-2d98-4156-aaf8-dc7b825db6e0/what_does_the_phrase_yes_please_mean.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_9e4db69816f94549a2726e5522a15434.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_2ce3d56f81ba46cc8d6938881f94f9fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51337fa-8380-485f-8e76-24ee982be8f5/zedexase.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3f394a8a495947e3a278eb6c274c0dd4.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_5392426a983f4ccfb7549d77d9ad01fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ee199d-1c1a-4cbc-b947-a8dfef68cafe/r_basics_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f40af96-4b3b-4816-8e63-03dfce613f57/donunemunepobasatamefesof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c836e7f-d643-43be-aeb4-0fc999a803b2/semorozofej.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_cb55e5297ff24bb9b1ee3ec2cb14a025.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/206d3380-ab90-4079-a897-a0c5e60a8e41/cyberpunk_2020_wiki.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_4f57c9df77c944f1b7a3fa9478896afb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0fa6ae-1ee1-4f44-ba11-8ff900508b7b/57299505099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8f54fc-e991-41c1-a3e2-78f87a55dcd1/electric_scooter_repair_san_diego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9ab920-4a4a-486a-986d-3e1681829e57/how_do_you_flush_a_rinnai_water_heater.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_fbf12809a18e4d77b21ef157c36f2875.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_3c5fdbf82afd4628973a7999267b423a.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_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 5348 bytes
SHA-256: 788b6bfc20111cff7067ceff739c1a50933b8a48793e83881d1a1e374a890754
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 10972 bytes
SHA-256: 347d57f7dc8393e7d8119e7a28892c55143b04627b8b46c40d891a65ce5f26a7

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