Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e644fe24fb726bc…

MALICIOUS

PDF

94.1 KB Created: 2021-04-12 15:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc0ebd722321110342ede40b7b440810 SHA-1: 648b6bd6df7b6539dd7a3ef63267708c0120de91 SHA-256: 3e644fe24fb726bcea916c389a126fb717e253602364ff18ab99d54fd86ea488
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site via the primary URL. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+to+turn+heat+on+mitsubishi+mini+split PDF link annotation
    • http://rujitexoxobag.mypressonline.com/english_to_french_alphabet.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/42019190000.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/5679236135.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/Shdigjg/arizona_lottery_scratchers_winners_left.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/nusepo_judaxaxefujagop_tigutopakukoker.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/KgdZGEU/download_maze._io_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/fhcigrK/laravel_form_html_entities_error.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/zapivog.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/2877491.pdfIn PDF document text
    • https://bidegibi.weebly.com/uploads/1/3/4/4/134476665/2246486.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/3194428407.pdfIn PDF document text
    • https://cdn.sqhk.co/gewowamizes/ahh4ojg/entergy_outage_map_kansas.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/46463076294.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/el_general_naranjo_caracol_tv_en_vivo.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/lezopobigeza/zudekibepakilonip.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/administrative_assistant_job_interview_questions_and_answers.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/52839303258.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/which_state_has_the_best_economy_2020.pdfIn PDF document text
    • http://xotopusedewix.myartsonline.com/ancylostoma_caninum.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/modal_auxiliary_verbs_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/jemipotawazolasedidu.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_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 5252 bytes
SHA-256: 3d6f3a2feec7b7f54ce66b59c00252a558780a0757994ed9c555ee973aca7e57
font_01_sfnt_off00014364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14364 11696 bytes
SHA-256: a98c4a535b65351fc545a57f78f6f3eee46ce22970ac416e286afb7f03ac3c31

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