Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e667a1e0bdca554…

MALICIOUS

PDF

79.7 KB Created: 2021-03-22 01:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a67f6e86f7d6520dfac978699c6f67d9 SHA-1: bd8118113556cb046e6c4c842c94798233f88130 SHA-256: 7e667a1e0bdca5543105be3a6a30ca8c5361bf1327dbe552ad8023b76c78f267
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=anatomie+et+physiologie+de+l+appareil+respiratoire+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380530/normal_5ff6c45890f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446287/normal_6003515a4718b.pdfIn PDF document text
    • http://neriwozu.22web.org/kiwivenopiwesiwimonoto.pdfIn PDF document text
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/zigovalo_mafof.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/beb76b1e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ff247aa3729c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_601e657d52c8e.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/24396044974.pdfIn PDF document text
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/midojugojaki_tozujubonaw_lulesedut.pdfIn PDF document text
    • http://zafufevede.iblogger.org/stokke_crib_manual.pdfIn PDF document text
    • http://pakisonuzaruwav.iblogger.org/67616411896.pdfIn PDF document text
    • http://kixorita.22web.org/evil_dead_3_tamil_movie_tamilrockers.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/vexovamosedisuniko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_5fd7d9a9353f2.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/38494160612.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/9419483.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetavirevamo.epizy.com/zedat.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/betopowivoselobeloke.pdfIn PDF document text
    • http://wobemiko.epizy.com/33656494952.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/home_at_last_sheet_music.pdfIn PDF document text
    • http://kevuwusifamakum.epizy.com/52770022190.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/what_child_is_this_greensleeves_piano.pdfIn PDF document text
    • http://zovavabiw.epizy.com/company_profile_presentation_ppt_free.pdfIn PDF document text
    • http://pugabovewel.epizy.com/economic_and_social_issues_in_management.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/mesevelonejetezoxoravurul.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_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 5544 bytes
SHA-256: 016e5105bf3cd184e52a2c15a9751c61491d77cd325680a60f68e50add17020a
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 11860 bytes
SHA-256: 49b1839774c1e12444cf09eb092d1d6d10bf50990cca62b627e8a21b447f1a83

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