Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef906879983b572…

MALICIOUS

PDF

82.0 KB Created: 2021-03-13 16:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0891d18d7758b57c05dc3378c59d1104 SHA-1: 5eb3748dd47bf413a0a97f5df2a94a4c3a70616e SHA-256: 8ef906879983b572ad8d7536b5cf970c16c47b8731f31f7ce19f4faacf0077dc
126 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 0.9996

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://botokaw.ru/strik?utm_term=lista+de+verbos+en+ingles+todos+los+tiempos+verbales+pdf PDF link annotation
    • http://freehookup.xyz/verb_patterns_gerund_or_infinitive_exercisesl2185.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/sat_prep_courses_bergen_county_nj.pdfIn PDF document text
    • http://yourlivehelp.com/bisecting_angles_worksheet_grade_7g62zv.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/ibRjcgc/motevikuziraxitaxavew.pdfIn PDF document text
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/8d0efd2653bb.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/sojogalotum.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/bjehdBA/89680936180.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/nilelavepanonebebi.pdfIn PDF document text
    • http://apparentlyopt.com/atrial_fibrillation_heart_failure_guidelines7vcgq.pdfIn PDF document text
    • http://fullstacket.online/dns_server_clash_of_clansox252.pdfIn PDF document text
    • http://alteramaks.world/xemojofubifefifigazugis2t70g.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/cC7jbgg/sacrifices_in_the_bible_kjv.pdfIn PDF document text
    • http://you-bestshop.xyz/80915743315bu0gs.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/76162900586.pdfIn PDF document text
    • http://idealicaitalia-official.site/konagadimamaleduxeput2noyn.pdfIn PDF document text
    • http://getfreecreditreport.info/79761359196o19hz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tenunud/sample_renunciation_certificate_form_india.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/college_station_police_department_arrest_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/animal_farm_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/xadakumezika.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/81529338889.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_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 5500 bytes
SHA-256: f3d130af515bc8c8715a5e1dab210e0c758b2d33cd5f18b0b13a85605b24d7cd
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 4440 bytes
SHA-256: a7c276b4e331fbaeb287568694f60e5c1503aaea4f32242db1d12faf9c2f25d1
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 11404 bytes
SHA-256: 829d6ed3bcf571c0a17238ed949296db5a6be1156ddb71e0331dbc086ce41b2b

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