Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62a5e8db85fb522…

MALICIOUS

PDF

89.9 KB Created: 2021-05-01 17:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1c7314637009aff30096d1fcb2b2dad SHA-1: d36a8ceb0c17e8c96b9333203c467d006d79c3fc SHA-256: a62a5e8db85fb52229adb91ea9e15391154c47aed571001abf7d8eac4b262eca
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated programmatically. The primary attack pattern involves directing users to potentially malicious external sites via embedded links.

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://fokemale.ru/strik?utm_term=principios+reguladores+de+la+economia+social+de+mercado PDF link annotation
    • http://nakekizedexu.getenjoyment.net/jotufewowolu.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/robert-shaw_thermostat_gas_controls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5ff46d9ada9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_6060f577de53e.pdfIn PDF document text
    • http://xadebiwivupogof.iblogger.org/vmware_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://rineset.xyz/41486832491ae0ip.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/american_history_books_2020.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/how_to_search_a_word_in_scanned_document.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/avantages_et_inconvnients_des_nergies_renouvelables.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_6045e35f76f7e.pdfIn PDF document text
    • http://idealslimitaly-official.site/which_phone_has_best_camera_iphone_or_samsungh0c7d.pdfIn PDF document text
    • http://tiktoktop.design/how_to_type_roman_numerals_on_mac_keyboardvzfwp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_604cb93b50d6b.pdfIn PDF document text
    • http://digovin.getenjoyment.net/first_things_first_cast.pdfIn PDF document text
    • http://kinokaiff.space/egg_drop_project_straws9wya8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weparaxopulo.atwebpages.com/accounting_interview_questions_and_answers_download.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/37340240279.pdfIn PDF document text
    • http://vekamodadon.onlinewebshop.net/walizawanuragavu.pdfIn PDF document text
    • http://mafofeguf.epizy.com/can_you_study_law_online_in_south_africa.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/forgotten_realms_series_order.pdfIn PDF document text
    • http://gedapewubu.epizy.com/fusuvele.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_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 5392 bytes
SHA-256: 2f927e8bb0ec1ce773c7576b72a8a3bd46faf847a007f46ab4471ac4302cbf05
font_01_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 11600 bytes
SHA-256: 0dc4dc8def04394e921373c57462e6d8b1ab3ddb8a04420e5b5c51dc7c3b315a

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