Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff758b8fa0cbb8d…

MALICIOUS

PDF

80.9 KB Created: 2021-05-26 02:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 634c12080c91e48cc45fedc992e2bc55 SHA-1: aa1af1a0b93c5e37a4bcf2487812fef17908ee85 SHA-256: 4ff758b8fa0cbb8dae8e99553d23c36cbb25afe0ca41e45e0ab75ee24640f2c5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO scam. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://golowaki.ru/strik?utm_term=how+do+you+facilitate+a+focus+group+discussion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446038/normal_600b940b86c28.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/df083f290a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_6047cf46b2139.pdfIn PDF document text
    • https://mozabedo.weebly.com/uploads/1/3/5/3/135323929/4654197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5fc812a6952cb.pdfIn PDF document text
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/dajol_junikudo_nezuzuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_60554526b811e.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/lageresufezir.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/2962195.pdfIn PDF document text
    • https://jovuwimuj.weebly.com/uploads/1/3/0/9/130969820/5266245.pdfIn PDF document text
    • https://lonewarole.weebly.com/uploads/1/3/4/5/134593790/bokowadevame_bolapilewokolel.pdfIn PDF document text
    • https://wijuluvewez.weebly.com/uploads/1/3/1/4/131437378/xuraxulikin-rubopa-vafisiluj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5fec4a30b28c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_606e088253edd.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/129cfbc64a.pdfIn PDF document text
    • https://wunopavowar.weebly.com/uploads/1/3/4/6/134660490/zenedagakedefan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_6056f5924f45a.pdfIn PDF document text
    • https://vusowixaxepuw.weebly.com/uploads/1/3/1/3/131381533/5bad9caf59b22.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/0aef2ee583d093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_6069a2f6a3d73.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/4081730.pdfIn PDF document text
    • https://redejejilitut.weebly.com/uploads/1/3/5/3/135305696/b1eaba.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/6266363d-e6e5-441b-9d4b-e4250d9d258e/66926391051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9e5d0c-ef43-4242-a8fb-3fe4358e3037/hp_folio_9470m_elitebook_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821b9064-8d3f-46a8-aa0b-82e8e141d1f2/the_kissing_booth_2_going_the_distance_book_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff79f593-9f28-43ac-b149-5f00d27e7157/zawanamubijiwod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a170e2-e3b1-423a-9712-e113597d825c/prestamo_coche_globalcaja.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_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 5476 bytes
SHA-256: 1d5f6c997c81cf0771ba71448ca11860ad0085fed370c54f986e608b7bbb0327
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 10544 bytes
SHA-256: 8e19de4835efc223963e5055906137f521379fbee16c13b9a517914a8a7aac36

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