Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9673dc9283fbb1d…

MALICIOUS

PDF

98.9 KB Created: 2021-04-26 23:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 407249ebd99a1566a375679d657a5860 SHA-1: 7a9821e122762a769624940fda1317c7c1e90c78 SHA-256: b9673dc9283fbb1d0981a11ca0310ecb7b86f759299702bcfb8110a2dde4d394
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://seumenha.ru/strik?utm_term=taxonomia+de+bloom+lista+de+verbos+pdf PDF link annotation
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/5317594.pdfIn PDF document text
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/rutikat.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/5815066.pdfIn PDF document text
    • https://xopekasas.weebly.com/uploads/1/3/4/7/134748476/woziderofexes.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/datamun-doxekopixut.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/Qiadiau/zig_zag_wraps_bulk.pdfIn PDF document text
    • https://sibovobum.weebly.com/uploads/1/3/4/8/134879451/053c2c.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/916a685aed.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/UHN3ACS/download_dream_winner_soccer_2020_mod_apk.pdfIn PDF document text
    • https://gijepunudadolow.weebly.com/uploads/1/3/4/4/134497403/1e5bc9165de7.pdfIn PDF document text
    • https://kusigalodedi.weebly.com/uploads/1/3/5/9/135965864/1995722.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/9487904521.pdfIn PDF document text
    • https://cdn.sqhk.co/penavagalo/yjdggc4/ground_driller_mod_apk_1._2._20.pdfIn PDF document text
    • https://wasafigazepez.weebly.com/uploads/1/3/4/5/134586721/wewowakolef.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/3220093.pdfIn PDF document text
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/kinez.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/nititebogisupuva.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/codeigniter_hmvc_tutorial.pdfIn PDF document text
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/nivizepad.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/crecimiento_y_bienestar_emocional.pdfIn PDF document text
    • http://nokunejojepeje.22web.org/maintain_automatic_teller_machine_atm_services.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://safedoguno.onlinewebshop.net/73434354558.pdfIn PDF document text
    • http://xigavuda.rf.gd/the_misfit_of_demon_king_academy_japanese_name_manga.pdfIn PDF document text
    • http://revujaruk.rf.gd/atkins_40_meal_plan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 5192 bytes
SHA-256: 2d3f358a72af783767bdb554a502b5897075aaf395d8d86abb3a17830c6e5e4a
font_01_sfnt_off00014559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14559 12852 bytes
SHA-256: 83488ae5a6c00341d6031c662cca0e7de5ca63c5908e0cd42ab15bd071764e22
font_02_sfnt_off00016e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E58 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3