Malicious PDF — malware analysis report

Static analysis result for SHA-256 f686a9bea209406a…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 07:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0136ac7d7af6f24d4714ca7b3ac6a631 SHA-1: 1b4009402622f4a104fc0b2ded35f359ac56a1f4 SHA-256: f686a9bea209406a4616bbd4b5f600d5df89a71450463a4bc8057ddc6584365b
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically identified as a lure for a case study analysis outline. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=case+study+analysis+outline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450732/normal_601ac854be1c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_6025c6ea44b08.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/lhjghif/free_download_smartphone_tycoon_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/hdkUXhc/puwutipiburedomuvugososid.pdfIn PDF document text
    • http://zodajixinijetu.22web.org/translate_arabic_into_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_604693616ebf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxudawikiteman.epizy.com/wow_classic_druid_quests_guide.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_bdbf5674ab02436c9564dfe928aa92f4.pdf?index=trueIn PDF document text
    • http://zovewopot.epizy.com/munisizefejidirinuwila.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_4e26a6a8698f4ba78944e821bc97326d.pdf?index=trueIn PDF document text
    • http://falalovoxiwada.epizy.com/the_company_of_wolves_1984_online_subtitrat.pdfIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_3a5e317de79541469e35177a5e83221f.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_9893571dc5814f5cbd214921d20c5080.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/analise_sinttica_e_morfologica.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/gi_sheet_gauge_to_mm_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d912872-6d19-422f-8999-e572c692f521/15100309955.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/rural_area_certificate_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01fb2cc-0820-4b14-836b-7c8c98863e28/falirepis.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_83755c834c904f7898c2bbf62e4974ff.pdf?index=trueIn PDF document text
    • http://roxutudutupit.epizy.com/video_collage_maker_software_free.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_off00010ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC4 4732 bytes
SHA-256: 1e2bbce371cb89b3c74b317424201cf13ce4c24dd029241c10acc60c7895cf4b
font_01_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 10768 bytes
SHA-256: 6ebcd4b46ce8513c102ca355337d0a46cf0250e9de1e7e6810ba751785007747

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