Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2bd27146204032…

MALICIOUS

PDF

79.9 KB Created: 2021-04-18 03:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fba5d53a744ed6c4574e1ccf9fd57bf8 SHA-1: 535f0dfe78c73464fc9c74cd659b759a4a745f32 SHA-256: 5b2bd27146204032c5b9bcd17f951ade1a736e0b6eb46d791b7f885279f0ff67
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=how+to+wash+cosco+scenera+next PDF link annotation
    • http://kunujunekedi.mygamesonline.org/gikagiwujokekuwuzupelogim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_605c993933979.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/ielts_academic_writing_task_2_sample_answer_band_9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485153/normal_6006e13297d78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5ffacc76f2b48.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/critical_reading_skills.pdfIn PDF document text
    • http://baditunabupiru.mywebcommunity.org/bloomberg_api_documentation.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/zolevetunaretazewosuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_5ff26e3480a56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/facebook_blueprint.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_901bde1514f74c61976f3870c14c3fe7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d4dd73-0b7d-458b-9d97-83da70234582/cuanto_equivale_6_pulgadas_en_milimetros.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/50618750203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d40b95f-d86c-4609-a0cc-64ed2b422a89/2842422295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba12540a-e340-40dd-a3da-2482f6fe4f86/engineering_economy_7th_edition_solution_manual.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/causes_of_lung_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5198240-20a6-44c9-b977-bd44f09421a6/napogadobufilumevokofet.pdfIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_18ec2722a6a749e4aee7d70ea9ed45ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2c50d0-aa85-498f-b806-de1dee2e7e59/limapid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35754c4a-0ffa-4944-8031-05a0f0b67ddf/22862618835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9c37d5-6f54-4bf0-bc6a-fe9779164917/winovixeperadiduv.pdfIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_94c00a43d2fd4939aee8aa9f3b1e1310.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_7420198f4cc74ad484dc9b648d649e06.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_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 4976 bytes
SHA-256: c3fa0768fd369e0f400a197927b593418ec46e3e769e42e31eb23cbe9c09cfcc
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 10680 bytes
SHA-256: 3a2c70f0cf50f184e1389e4d9e0436f5820ab7dbf81c7636a492fead2efea9ba