Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efe2688dc10b929…

MALICIOUS

PDF

70.9 KB Created: 2021-02-25 20:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 116d48dbe9e78ba30e04ffb61f438a47 SHA-1: c96fe2baa287dd60bd31fcf98261988d6950a975 SHA-256: 9efe2688dc10b929e5e4eb82f0c292afce1c1b4248530aaeffee1c10da2ab52f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary URL being https://maypoin.ru/award?keyword=root+board+game+rules+pdf. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/award?keyword=root+board+game+rules+pdf PDF link annotation
    • http://mavigawika.scienceontheweb.net/warm_bodies_2013_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_600f4a31ac01d.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/jedesajasakalur.pdfIn PDF document text
    • http://penerete.66ghz.com/capability_definition_documents_guide.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/39276415494.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/how_much_does_a_sony_bravia_55_inch_weight.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/english_literature_online_courses_in_india.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5ff11720c0272.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/19632016635.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/do_gamestop_repair_consoles.pdfIn PDF document text
    • http://jupuzagap.rf.gd/49647599021.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/38750156746.pdfIn PDF document text
    • http://jefebewo.epizy.com/handwriting_sentences_practice_sheets.pdfIn PDF document text
    • http://mujujum.epizy.com/liwexovarotuwujadubudebeb.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/immanuel_kant_philosophy_about_self_quora.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_to_light_pilot_on_williams_wall_furnace.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/46615330247.pdfIn PDF document text
    • http://dowirimidezifa.rf.gd/syubbanul_muslimin_addinu_lana.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-nIn 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 5508 bytes
SHA-256: 3a5c664aadd30b21507d4bcdb75b26edf9c2f88dd0216175d6b74a67ec978d86
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10892 bytes
SHA-256: bb6e6a0b36300ebf9b55a905c3bd3c1c7538b15726a4ce1f5e6f4edf76f4db2b