Malicious PDF — malware analysis report

Static analysis result for SHA-256 37df9ca6a6a63d61…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 00:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2255d441f5fb71692bdc63222cfd0f8c SHA-1: 19d91d471f9f8e60025c6d8bf36e1f36720ece86 SHA-256: 37df9ca6a6a63d61c53887624db1363a771f0271bcd63009b1a30f4e355d7e2b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=tactics+for+toeic+practice+test+3+pdf PDF link annotation
    • https://rabupipimefife.weebly.com/uploads/1/3/0/8/130874594/fejusugovuzegeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_604df00edac9d.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/Riav3je/45961189566.pdfIn PDF document text
    • https://lujoduxatodovaw.weebly.com/uploads/1/3/2/3/132302833/1407881.pdfIn PDF document text
    • http://wojisub.mypressonline.com/introduction_to_automata_theory_languages_and_computation_solutions_for_chapter_5.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/92a4a9.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/webafejebo-gifolu-zaduzevaxived-xaxifaxenabe.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/bonow.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/4156745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5ffd2ddc8ac94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_60506392d46d2.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/Tiejgjc/eas_simulator_pro_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_602df3e0a9269.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/vatosolikijike/win_10_update_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/the_sword_of_summer_full_movie.pdfIn PDF document text
    • http://kazewedofuvula.rf.gd/mapa_geologico_del_ecuador_2020.pdfIn PDF document text
    • http://vozuxekeve.rf.gd/biggest_video_game_companies_in_canada.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/international_marketing_information_system_ppt.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/how_to_tell_if_a_pimple_is_healing.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/video_er_professional_extension_for_chrome.pdfIn PDF document text
    • http://kubivakov.epizy.com/endothermic_reactions_vs_exothermic_reactions_worksheet_answers.pdfIn PDF document text
    • http://rakorexifaxokur.rf.gd/capitalisme_socialisme_et_dmocratie.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/intermediate_cuneiform_bone_muscle.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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 5232 bytes
SHA-256: 5600235d4f2ff09d6444ec75f0043ee2a3bb683c56918feae4c59788676240d6
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 18492 bytes
SHA-256: 078722852caef77421281960dc2593a9187f15f9edbbd6c158ff2e4c0f0da067

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