Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da8f49dce3f6a98…

MALICIOUS

PDF

76.4 KB Created: 2021-02-17 10:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 784ae0a26b75a3e85fafefda73396936 SHA-1: 6f9d2a1c72571cfbfae2c6f1d4eca629dab59756 SHA-256: 7da8f49dce3f6a98525fb0494faa2be895ba9c6e00406cf4c6325ac999b65b0b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant number pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, common in phishing campaigns. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=consejo+nacional+de+participaci%25C3%25B3n+social+de+la+sep PDF link annotation
    • http://frontend-developer-azaynullin.site/17036455765uc0xm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fec6a3802db2.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/hfvWiNe/cbs_sports_fantasy_baseball_keeper_rankings.pdfIn PDF document text
    • http://shtangye.xyz/dominio_contradomnio_e_imagem_de_uma_funo_exercicios_resolvidosb3971.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/jhhcHja/6949632139.pdfIn PDF document text
    • http://lasleymarkt.ru/italian_folk_songs_sheet_music_free2tike.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/jdhgZ6y/drift_war_apk_download_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/qhcxQnk/age_of_empires_2_multiplayer_strategy_tips.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389794/normal_60078ee327462.pdfIn PDF document text
    • http://reduslimitalia.site/lecture_ready_3_second_edition_answer_keyp00b1.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/dshhghc/motorsport_ireland_karting_calendar_2020.pdfIn PDF document text
    • http://henrysavbr.site/44070550426zebzc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fcf50f5a319a.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/djiicjf/55396871712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5fd05830b01a2.pdfIn PDF document text
    • http://tryne.xyz/cartoon_movies_2018_list0elrl.pdfIn PDF document text
    • http://radanews.site/368824817483gksl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomupobidep.epizy.com/69344647441.pdfIn PDF document text
    • http://sivokag.epizy.com/a_modest_proposal_text_analysis_satire_answers.pdfIn PDF document text
    • http://xinirujoki.epizy.com/cheque_requisition_form_template.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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 5184 bytes
SHA-256: d0717d7fa109ff2566c44a6cf5d95cb4f4df839af250ffb1575a00a06e8c1d3e
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 11456 bytes
SHA-256: b93c8b5c9e49656fc672c0411b6b1282a98be00586eac9abd7ae61f41988baf0

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