Malicious PDF — malware analysis report

Static analysis result for SHA-256 1771c25881e3c1da…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 01:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e7895c1d54d1429a8264a09b7d8c2b8a SHA-1: 8ec43b8909cf59d041428bc5143272dd6b0f4222 SHA-256: 1771c25881e3c1dac9dc498c7244c237d847893fcb216f8ad55cdd2237db614b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=obtencion+de+capsaicina+pdf PDF link annotation
    • http://tesar-krd.ru/sisejitetu4ytk4.pdfIn PDF document text
    • http://reduslimer.website/principles_of_humanistic_psychology9w66g.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/8GObBgc/80191089726.pdfIn PDF document text
    • http://acupofjacob.com/xulugowelozopewidetn2th1.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hfwi4pu/vodafone_yan_mda_ev_internet_hesap_ekleme.pdfIn PDF document text
    • http://tabikola.online/diary_of_wimpy_kid_book_collectionwwzk7.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/gRGLhfe/vofatuvuxuvevevuxifaji.pdfIn PDF document text
    • http://tryadasert.online/bram_stoker_dracula_quotes7jra0.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/GFfgjhd/pregnancy_week_by_week_pictures.pdfIn PDF document text
    • http://nout-prodat.site/2362598592858dti.pdfIn PDF document text
    • http://azules.ru/civil_engineering_interview_questions_and_answers_free_download_in_hindish3c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_f06cb87a09ec46838928492b4afdebb4.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_945ee7a035f9420c80ee3dc84ecd41e5.pdf?index=trueIn PDF document text
    • http://biponutagovom.rf.gd/belekusevinokunipudi.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/how_s_it_going_yahoo_answers.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_dfc1da88705f4e30987280dabd0120cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogunabones/playground_vocabulary_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/letter_template_font.pdfIn PDF document text
    • http://mujunuge.rf.gd/kuwemumibovamevulalezoj.pdfIn PDF document text
    • http://jegujijixunef.rf.gd/medicare_claims_processing_manual_chapter_12_30.6.1.pdfIn PDF document text
    • http://fumitosavewi.rf.gd/time_warner_remote_not_working_with_cable_box.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_07ea7df0ac5e453aaf5e6a587aa76c13.pdf?index=trueIn PDF document text
    • http://bidasumibave.epizy.com/ginuwamivofevofe.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_9ddd9f7ba3164c2d9e14b59aa373fad2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakevoja/deep_water_itv_episode_guide_wiki.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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 5188 bytes
SHA-256: 5fb96b862335d16edaef3df663050ba06bab6816d7915c8e7fbb23b0cfad292a
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 12072 bytes
SHA-256: 458acfcac1a847bcf026c21be69c946d544ab22d2eb9c9571d0860b157b54842