Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9f7d9eae654c00…

MALICIOUS

PDF

84.2 KB Created: 2021-05-22 22:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da25ccbab13b182109f9bfea726cc394 SHA-1: 90cb80c0cc6c13b46a6e20fd7e15bbd4ee987e1a SHA-256: eb9f7d9eae654c005d90d6b908194fb187c9e7b649771e4b4e4ad0e337a47399
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://zajinet.ru/strik?utm_term=ejercicios+de+razonamiento+matematico+para+secundaria' is a primary indicator of the malicious destination.

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://zajinet.ru/strik?utm_term=ejercicios+de+razonamiento+matematico+para+secundaria PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5ffe48927b623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fd2ec6ebfa35.pdfIn PDF document text
    • https://zasazijubafal.weebly.com/uploads/1/3/5/2/135299125/lifego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_6020d7c986961.pdfIn PDF document text
    • https://golasirase.weebly.com/uploads/1/3/1/3/131384643/porutogetanazebe.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/73b4d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_601ee6c415d96.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/wujekaravoxup-tiniregasadufa-pujosuz-palewopupowej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_5fd713c94619f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_6021bfa7d1f5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/automation_testing_resume_format_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/lapujorogubevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ad9ef6-4df4-4941-88a1-e7f539d57357/33838753632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760444db-1b2e-4863-9171-84d0a18acf41/libro_historia_universal_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9289ca7a-a1e2-48cf-840b-bf6c4d7124a0/74467346078.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_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 5268 bytes
SHA-256: 7a1227a80d80104cdaa422da6f7fbd81eb84536e72b0f7f7cd54486f60691905
font_01_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 13204 bytes
SHA-256: 6e3311329e9fccb9e49a44f6c703b4a63c619586519282315e97510e6e307333

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