Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea2a63b76583b7b…

MALICIOUS

PDF

86.9 KB Created: 2021-04-26 11:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bbbbf96c24b5b63c86b9323f832f0419 SHA-1: 41dc51bd614762d2ac3456930098c193b613b578 SHA-256: bea2a63b76583b7b46e1a02c2a71c446435bd45ee9217b1ccdd4edd8928f76b3
186 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external links, many hosted on disposable domains, designed to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://crophysi.ru/strik?utm_term=the+looking+glass+wars+summary PDF link annotation
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/tigedabetosenel-vejeg-newajukupa.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/1220488.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/physical_activity_readiness_questionnaire_acsm.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/english_grammar_basics_tenses.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/gj6ieEH/lojefazojijasajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_601a5472c2c95.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/3eRvKEX/pa_archery_black_bear.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_601e49fa7ec5b.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ZEACaih/the_light_phone_dashboard.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/vewugojilizak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_7103668c55334d3bbae9cc0d0935d081.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_3b486deb6bbd47399667d71593841afa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/166879d9-6d97-421c-bc63-34a006d8fc89/numinerujetelipogu.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_82ba0ba0e79c48569f5aa1ce1540f9da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ea3369-bdaa-43fd-af5a-61a1575ee11b/35984676648.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_936de2525cb643b4b7c0f296af52a314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb4b52c-e50b-4e2f-a0e2-4bf1e18b0734/tovevugonuvomapulofijoku.pdfIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_1786a1d0ee61483f88d4c4ccce107d40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22467153-4c63-4718-9363-d55351f79ba3/zokod.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_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 5308 bytes
SHA-256: 8b358e781f4800e57d9aee45e90ff68f32d7341b4b581aea46571f85165c8aa8
font_01_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 11180 bytes
SHA-256: 77fbc3de9f653a3859e3d28c238b98f1f7f50cac1c6720da9ab94fc763c6dd26