Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89065e27313f713…

MALICIOUS

PDF

73.3 KB Created: 2021-02-26 14:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 19d2e29889caa438871708f76a26ef09 SHA-1: fcaa6919c8227493040f0b360052dd3c265400dc SHA-256: c89065e27313f71317145a9d0bed0717d682113db80aca85108015061add1e60
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, with one pointing to a suspicious domain ('ponafet.ru') that appears to be part of a link farm designed to redirect users. The presence of multiple distinct hosts and disposable domains suggests an attempt to obscure the ultimate destination or evade detection. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=brother+tn+630+wifi+setup PDF link annotation
    • http://famozosivupiwij.sportsontheweb.net/no_matter_the_wreckage_table_of_contents.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/diablo_3_season_22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fd0fb565e40d.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/lasejedoxibub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_6013774031ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_600e32f2e01ca.pdfIn PDF document text
    • http://bezigex.iblogger.org/14370009188.pdfIn PDF document text
    • http://citimart.online/wagamama_takeaway_menuiuo1k.pdfIn PDF document text
    • http://anrostore.ru/el_camino_del_artista_en_accion4ypgn.pdfIn PDF document text
    • http://itawomen.fun/what_are_the_zeros_of_the_quadratic_function_fx6x212x-7hn6t3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tegewixu.epizy.com/64893516790.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/books_of_the_bible_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/mandatory_reporting_legislation_wa.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/movimiento_uniforme_definicion_para_nios.pdfIn PDF document text
    • http://mejefelutirarej.epizy.com/evine_clearance_sheets.pdfIn PDF document text
    • http://paborijobo.epizy.com/xoxarodud.pdfIn PDF document text
    • http://sobakijej.rf.gd/wetlands_wow_quest_guide.pdfIn PDF document text
    • http://porojerosisogu.rf.gd/universal_kathisma_2019_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/72552014437.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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 5348 bytes
SHA-256: f6bba212ec50154e4d840cfccc5f4fc89c29c51fdabfb58c9b7b5d81c8c0fa33
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 12320 bytes
SHA-256: e39e7bd2490c2a3b7b33f502575c4d042061b40e7fa2f9bb0b70a13b9163bb21

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