Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e28fc39260b0af2…

MALICIOUS

PDF

90.9 KB Created: 2021-06-01 07:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b10895b882a024c3a3a6875fdc9b6bd6 SHA-1: 5f75f7dcb5287f040dbb6f48249ae53873ecef44 SHA-256: 3e28fc39260b0af2888f0f00352c1353ef238a6b1b52de36bd2ac1d2d9fd4171
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are used in a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/pbw?utm_term=ielts+general+writing+task+1+and+2+tips PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449614/normal_6003a8d844ef1.pdfIn PDF document text
    • https://mixogefok.weebly.com/uploads/1/3/4/5/134587058/14e051637544.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/mapexubalavebe-xetuwikumijibe-leruta-guxezewevatiwe.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/wipepeburopa.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/wovadibivululoxulawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_600ea517a0e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_6047aef86825b.pdfIn PDF document text
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/sazusezeniwezef-dosepatewazoma-nenavuwilaruwu-pesofepujivato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6029c4fb0c69e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_60011db12fadc.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://ziduzobif.pbworks.com/w/file/fetch/144440868/how_to_get_a_service_dog_certificate_in_florida.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144415500/bank_of_america_mobile_banking_app_apk.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/28922794150.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144437280/musically_auto_followers_apk_download.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/29683738581.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144444990/87294134097.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423462/buvirixu.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/news_report_examples_ks2.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/evaluating_numerical_expressions_with_exponents_worksheets_answers.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144414483/economa_bsica_rodas_carpizo_descargar.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_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 5084 bytes
SHA-256: 5ee61d9456325fa6d939b0fe1a4a3bee4a0fbe45e0fafd7b865d4e057a52e89f
font_01_sfnt_off000128a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A0 11676 bytes
SHA-256: 60e37c721fdebef16f09b7267b54f097fd7e1c983c887d2aa67ef3f9f0e34f61
font_02_sfnt_off00014fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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