Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a43ecdec77f7e5…

MALICIOUS

PDF

66.1 KB Created: 2020-11-10 16:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 26bc60a32cd25737cb17edae033d211d SHA-1: 1337d56c507b437146e11be9ebb0d65c44c8816e SHA-256: 84a43ecdec77f7e5403ed8431574deefb650374892cb0a2bda4a212cd2dff44b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://trafficel.ru/strik?keyword=words+with+proto+root', is a strong indicator of malicious intent, likely for phishing or malware distribution. ClamAV detection and ML classification further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?keyword=words+with+proto+root PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5fa4cb414786f.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fa3b0d86fa90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fa2438d5fcef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f88a70ad31da.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/9e8dede6ac.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/d55262c3-f6bb-4272-a19c-c01b2132d7fa/xakawugumijule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50763e48-dd57-4bd4-8486-ea09e9ee15cc/luwigitameduzuloro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddde00f9-cf84-458e-a346-a28b42724772/toms_diner_song_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b94c96-ef7b-42c0-a1cf-c4daa6a90a4c/doa_2_hardcore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ddb69f-e2cd-416b-b1ec-99bbe85ce804/62334365444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfe7e85-de7e-45f6-b1b8-8be7b2504758/gonuzuxepuwomagobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83cc067a-021f-4357-b9f3-fa3e22e6c818/12293824795.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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 4912 bytes
SHA-256: 728f32e5399453b0ad46035d9ecba06901b3a4bdf1724872ff81a151a060810c
font_01_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 12008 bytes
SHA-256: 74cb96666c284d0bf79c3dcd579f8ebf094a8719001f9e96682e1566ec9a62e0

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