Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4390e278be95183…

MALICIOUS

PDF

78.5 KB Created: 2021-05-28 07:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5f20a5a7a8b9f26595a4c6399a2f17dd SHA-1: 9766e149cd22d7dd6700645dbd7f02a539d8a3ee SHA-256: f4390e278be951833a875453805625953f78a0bda15c69876f8ff2ceb6193b72
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=a+good+witch%2527+s+guide PDF link annotation
    • https://bedamenupal.weebly.com/uploads/1/3/4/7/134721947/kuxivunoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_60305b4149f7d.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/bepurebetitim-jexukoxum.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/7923590.pdfIn PDF document text
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/becb92.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/dikoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_605c94a904a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_606e0784c1d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6018b550c35d9.pdfIn PDF document text
    • https://megivewoza.weebly.com/uploads/1/3/4/8/134859273/022ddc2.pdfIn PDF document text
    • https://rotasemenedifo.weebly.com/uploads/1/3/5/9/135985080/5ed99acfc85c925.pdfIn PDF document text
    • https://kibujedazem.weebly.com/uploads/1/3/5/3/135347543/5818455.pdfIn PDF document text
    • https://zanikegira.weebly.com/uploads/1/3/1/4/131437850/54786.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/medopebotadupidadef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_606df30ada40c.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/45913ed6-9e9d-41da-8470-296436643bf0/biblia_hebrea_interlineal_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b92f29-1bf1-43d3-9f68-c3224f1bd67f/what_statement_summarizes_the_main_idea_of_reciprocal_determinism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f016739e-b4b6-4ace-b632-48c430ab631a/minn_kota_i-pilot_link_lowrance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cd5e27-18ea-4395-b7cc-4cf95fdb03e9/33723666014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4780eb8c-0a3f-4d1a-a706-ba1fcc407b07/lalozakukapugimafuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8441ca5-3559-449c-9647-52848f12fc3c/principles_of_mathematical_analysis_third_edition_by_walter_rudin.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_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 4976 bytes
SHA-256: 7884e9139a75053f8e18931f41ffd82f7cf97981928e657e46855f8319a457a5
font_01_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 11124 bytes
SHA-256: 3129271b365eaf6fb9784260029c502f9f8a1362696906269951da08223b0e36