Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9c527e7f037276…

MALICIOUS

PDF

74.8 KB Created: 2021-03-08 00:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99f91ca6de58f38e67f68ff2077ff5ee SHA-1: 340a8ea37ee4d395b5fa61e3e54c6875b7def60c SHA-256: 3b9c527e7f03727681bc6e4dae2405a1cc5df6e419857de4e6eb2935d87d7e2d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to distribute malware or phish users. The primary URL, https://baarspo.ru/strik?utm_term=brother+lock+1034d+needles, indicates a lure related to printer needles.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=brother+lock+1034d+needles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fe80650ab12a.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/kuwamojavolovuvuwe.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/pelex-fofewupivivavin-kozuwalez-fesavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418567/normal_5fc91e6a4d7cc.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/icjgJje/lullaby_songs_for_toddler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_602c0452d6212.pdfIn PDF document text
    • https://jaxowukijov.weebly.com/uploads/1/3/0/9/130969500/mokomufizip-vedubajeg.pdfIn PDF document text
    • https://nalirukixew.weebly.com/uploads/1/3/0/9/130969663/welof.pdfIn PDF document text
    • https://todukikezigegu.weebly.com/uploads/1/3/4/3/134359798/2707818.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/YBOgegg/jeladusodama.pdfIn PDF document text
    • https://nolobatunu.weebly.com/uploads/1/3/0/7/130740420/jipozeraxu.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/d1jg0bM/fabikumafokuvesuribubugix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_6014d899ec7d5.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/8052330.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/butabutawelofep_gujajugefe_murerodagodogi_mazofisizid.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/jga7nHg/57921916362.pdfIn PDF document text
    • http://noxivivixuza.22web.org/aggiornamento_android_pie_lg_g7.pdfIn PDF document text
    • https://cdn.sqhk.co/kimamena/gdjghiG/41475333273.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufonokimilije.epizy.com/fesojolezipad.pdfIn PDF document text
    • http://deketinak.rf.gd/latex_template_title_page.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_7984ea899fb44b51b7421bb2ca205153.pdf?index=trueIn PDF document text
    • http://wikidupuzok.epizy.com/jemaxewadofi.pdfIn PDF document text
    • http://sapakebozo.rf.gd/dd_5th_edition_character_sheet_fillable.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_c3e7157bbc534e11bd4649f50bd092cd.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_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 5376 bytes
SHA-256: eed11ea5a24c8677d1de328f024cd6d2df62248e639540dc78c1e2713c87e385
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10628 bytes
SHA-256: 2d063b3a3e71e76fa6d691fb04a1a6cf26e1fbe780c610c3586d110b95c85b35