Malicious PDF — malware analysis report

Static analysis result for SHA-256 4064b36d5abca43c…

MALICIOUS

PDF

71.2 KB Created: 2021-05-31 04:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 92ca943f5ce80f164a9250ddbb0e27b5 SHA-1: 30b558c7b7ba6a0f072b5bf94283fdfebfc3b3a6 SHA-256: 4064b36d5abca43c086f79a9b100c7da7cbffacf89d1828664525edbdfed9217
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains, under the guise of a 'vocabulary workshop'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://leonvi.ru/strik?utm_term=vocabulary+workshop+level+orange+pdf PDF link annotation
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/sezig.pdfIn PDF document text
    • https://kisoxorojapaga.weebly.com/uploads/1/3/7/5/137512046/5508874.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/4319638.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_600985a57edaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_60336945cd42a.pdfIn PDF document text
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/jinubibog_sedijojosizi_kadudid.pdfIn PDF document text
    • https://nawogixabejuj.weebly.com/uploads/1/3/4/6/134617161/2097942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_6032379ebdb87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_60302359c8083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd645d9866ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_6036c521ef6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_601d3370c0e6b.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/e1ca2835d956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_600cb60866c4b.pdfIn PDF document text
    • https://dakuxemi.weebly.com/uploads/1/3/4/8/134883968/7113071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_603fd9af8b01a.pdfIn PDF document text
    • https://texodixoxi.weebly.com/uploads/1/3/1/8/131857215/kajexot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_603493aca6336.pdfIn PDF document text
    • https://gixawixo.weebly.com/uploads/1/3/4/3/134322292/9fad2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_600f135e7fdc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_606225787f304.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/81643fac-9a0f-446d-ad20-5521a57be85c/52868827650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe37eaf-4347-4889-bb0c-a8b4903a3a8d/pokemon_emerald_zip_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdb7fec-87d6-48bc-b045-84897994527a/active_and_passive_voice_exercises_for_class_7_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91521505-4faf-4420-a2a7-b057973bdcd9/nuzevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b53466-ff4a-4028-b649-eec596967a92/types_of_valves_used_in_hvac_systems.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 5840 bytes
SHA-256: 2cd1288b6cf0225071a32a5126f7ac0bfa8d9d9490db9a970c9c650a6d9d60f9
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 9940 bytes
SHA-256: 53c29ed053c32d9563c9fa170b35b52a0dcdc3ea8aabce69b2c90eec1ca093d4

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