Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d0504430d2e837…

MALICIOUS

PDF

79.4 KB Created: 2021-04-12 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 738ef7491a1dcbcd83966ca7a9248a54 SHA-1: 58ece4f0407e4de1c8c9e2865e249d480bdb46fc SHA-256: a3d0504430d2e837f833a369c30726b58da0ca80c3eb4cdccf0c7162cf4725ef
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dafemum.ru/strik?utm_term=madame+bovary+1991+watch+online PDF link annotation
    • http://govakokes.22web.org/vanafa.pdfIn PDF document text
    • http://zusazibob.iblogger.org/mindtap_chapter_5_quiz_answers.pdfIn PDF document text
    • https://bivojivowuru.weebly.com/uploads/1/3/4/7/134726538/diwufel_rolizezimug_lanesin.pdfIn PDF document text
    • http://zumbayuliya.online/descargar_anthony_santos_canciones_viejasckoka.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/ifPu9gf/65767401059.pdfIn PDF document text
    • http://kayikciakademi.com/psychology_principles_in_practice_answers5mscf.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/gjJMid0/the_outbreak_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/iiicWgi/dragon_city_menu_foley_al.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/jchiTid/dubai_creek_tower_floors.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/delonghi_ew7707cm_oil_filled_safe_heater.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/mewezakiluja.pdfIn PDF document text
    • https://pegojuzifaxoda.weebly.com/uploads/1/3/5/3/135309499/7f5b22a7ee29c0.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/kytgf1I/intelligence_services_commissioner_report.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/nogipevas.pdfIn PDF document text
    • http://idealsit.fun/fovapagizefa1ln9f.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/gicifd2/33996421034.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/ibichj8/96295391849.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/bVijgol/dents_de_lait_chat_douleur.pdfIn PDF document text
    • http://quickpapp.online/icom_portable_aircraft_radiok725f.pdfIn PDF document text
    • http://all-system7.xyz/2019_s60_reviewayfz2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumepenitujox.atwebpages.com/burger_king_application_2020.pdfIn PDF document text
    • http://vodupuginotipir.rf.gd/49038005792.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/sebatinopax.pdfIn PDF document text
    • http://jewikotadukusug.rf.gd/financial_reporting_jobs_in_dubai.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/social_enterprise_definition.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5608 bytes
SHA-256: e7d3cee3f66ce8410b38f64a117094659495838e2fdc69b8c4f6303aa85c1a6e
font_01_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 12732 bytes
SHA-256: 6f9219c1e01adcacf4528ecb7bf23fb7d568f63e5071ee2628bf69d8c50ae455