Malicious PDF — malware analysis report

Static analysis result for SHA-256 990c9e2d83eed661…

MALICIOUS

PDF

76.3 KB Created: 2021-04-21 07:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a4dce32fd31014dbabce6a0f99a4959d SHA-1: f3af7ec2849253eb4565b066ded0946174e2e537 SHA-256: 990c9e2d83eed6613b6a93f75e6313c3594547817f398349ddd53d247f28dcf0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the PDF's primary purpose is to redirect users to potentially malicious external sites. The presence of embedded URLs and the link farm behavior strongly suggest an attempt to direct users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=inequality+review+worksheet+algebra+1 PDF link annotation
    • http://shortsomfj.space/ascend_performance_materials_email_addressqsbne.pdfIn PDF document text
    • http://oneitshop.pro/the_book_thief_ebook_download_epub9oish.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/acid_base_physiology.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/gusubebizono.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/64401196156.pdfIn PDF document text
    • http://afracheat8.xyz/quite_imposing_plus_4wfcc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fea062437080.pdfIn PDF document text
    • http://mebovaduzi.mywebcommunity.org/godunid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5fe89f193b9d0.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/917616239.pdfIn PDF document text
    • http://operationhomeplate.com/how_often_to_change_honda_cvt_transmission_fluidebtxg.pdfIn PDF document text
    • http://eurozone.pro/who_can_solve_a_rubiks_cube_the_fastestqny8i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_605a63e4a310d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_67f8cd7d1bd94a5faa2ab2a375aa1a27.pdf?index=trueIn PDF document text
    • http://bigapenegig.atwebpages.com/2006_bmw_330i_rims_for_sale.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_d93955b6a2a24a5b8b490ac02ff729c9.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_bca256a0884c45ef98fdb0b18a12d715.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/13359726993.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_0266309560b84dbd9ad05eefdc99a101.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_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 5520 bytes
SHA-256: 773e59b723380e79666dffd53c5737644fff72940a681491f0c2ba069dce0c09
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 12508 bytes
SHA-256: db2f5d2440ebb3fe24e919afa15fa58cbeee0ae98f16843c2e8c384eaa3f7ab0

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