Malicious PDF — malware analysis report

Static analysis result for SHA-256 943752bd3c2746b5…

MALICIOUS

PDF

81.8 KB Created: 2021-06-06 06:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 930c2495de95b88e3fdd76780e0455f9 SHA-1: 09d35cc618f51a461be88c2a2839f9979a78abe2 SHA-256: 943752bd3c2746b5deb3d41231ed2a71573f70fe80c4130a5740d3ff8e091057
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external websites, with one URL specifically flagged as suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=ejemplo+de+monografia+para+ni%25C3%25B1os+de+primaria PDF link annotation
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/fanetalusape_gomimelojuve_fajofixurozonu_didigowudo.pdfIn PDF document text
    • https://fowanexi.weebly.com/uploads/1/3/4/6/134648222/c18ddf9d34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_604d11a8f4193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_603599f0e2626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_602dcbb65790f.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/1110351.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/5270683.pdfIn PDF document text
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/pitegijifogovasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_603813b53dd5d.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://rimogeto.pbworks.com/f/how_to_study_beta_hcg_report.pdfIn PDF document text
    • http://lojefizowoj.pbworks.com/f/ice_age_3_movie_in_hindi_online_watch.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/48187068486.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/f/26796977136.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/blackweb_power_bank_wireless_portable_charger_10000_mah_black.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/tezixuwagaw.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/memikitofuruwezun.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144674523/geneduditededesafujejap.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144460914/disable_low_battery_alert_on_android.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144601431/vuporirazixulidawezuvusex.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144518034/73376725256.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/myofascial_pain_and_dysfunction_the_trigger_point_manual.pdfIn PDF document text
    • http://gutupum.pbworks.com/f/mepeban.pdfIn PDF document text
    • http://zulamiz.pbworks.com/f/powimiwenibajodevidaf.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144578943/nirudesebapoxuboxanofifu.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_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 5316 bytes
SHA-256: d6ab3d3d37c159e8ecdbfdfb45c34588f546ea86f19e5b17d01463597201852e
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 12136 bytes
SHA-256: c3c9db3675fcf13c981160f95ea1a044cfbf3f970babe6bc8120ca0723add221
font_02_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f