Malicious PDF — malware analysis report

Static analysis result for SHA-256 03884b966de6b9e1…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 16:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c97744cb3a6ed1e0b8eb4c67e57af3a3 SHA-1: 263934bb9f18424fc9017c6c4056e9610c876737 SHA-256: 03884b966de6b9e1a7d6c4f9275cc257133072a2cea5bf0e457ba3104f56204d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=art+book+dark+souls+3+design+works+english PDF link annotation
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/2831306.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuravaxoxi/VjchHok/candy_crush_soda_saga_download_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/ZhjghK2/38786300171.pdfIn PDF document text
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/3be5328df2.pdfIn PDF document text
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/lunotutarumufosudir.pdfIn PDF document text
    • http://merishwheelrecords.com/tajunodumijivuh8ad6.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/16751767556.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/63bdb319f035.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/agcigI3/kinenezodidaf.pdfIn PDF document text
    • http://ekbsite.ru/thermo_king_apu_dealer_near_mewdp5d.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/14370173760.pdfIn PDF document text
    • https://kadukutinebi.weebly.com/uploads/1/3/4/7/134747046/5aa12.pdfIn PDF document text
    • http://afracheat6.xyz/zuzibukaxeginotutidawad2h32.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/IjhgcVf/arma_3_campaign_dlc.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/ifhdhgV/field_assistant_manager_walmart_salary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_9c1a81875fa14600918d918e74d26529.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_ad48d98b59404a46835cc0421be69736.pdf?index=trueIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_22fdced597b34a6faf2d48ff0437c2df.pdf?index=trueIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_d49fd083c63343a085c716e0af95aa9d.pdf?index=trueIn PDF document text
    • http://vatonafikokex.atwebpages.com/etapas_de_la_auditoria_financiera.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_2b5523fd5a7243fdada7c3a1aef969ff.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_df712d480cd3471f94878047d01fec7c.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5536 bytes
SHA-256: af22181f13903cffc0c0f179aed89b33640cadb9ff283b24d1e698dcce35ed18
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 15908 bytes
SHA-256: 48680d66ce78b391a02c7767d88c000b735f6d3737895499481e0df88d20d42b