Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee84a81d9be14c19…

MALICIOUS

PDF

80.7 KB Created: 2021-03-30 06:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c52e67f9489dae999850558a9a4943f SHA-1: 1f707a127b999de94a89203734f68998746f7730 SHA-256: ee84a81d9be14c19c38e9edab410425156fbf05aa531b3c0023e2459fa7f7ca1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms on disposable hosting, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or redirection attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://leonvi.ru/wix?keyword=green+bay+seoul PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480893/normal_604629ae18ee1.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/xezubuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/jA65Thj/kpop_male_idol_popularity_ranking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_602b0722064b6.pdfIn PDF document text
    • https://cdn.sqhk.co/kavevanix/kY58F2K/hyderabad_weather_report_telangana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6050c98cbcc16.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/darker_fifty_shades_darker_as_told_by_christian_free_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fe78f0fce75e.pdfIn PDF document text
    • http://zexezolevonim.iblogger.org/billie_s_bounce_bass.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_603e2c663458f.pdfIn PDF document text
    • https://cdn.sqhk.co/wusoxopejezo/aihhdif/whatsapp_de_colores_actualizado_apk.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/aerostar_600_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/hehbZii/87497848804.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/asjnwzp/best_electronic_music_for_studying.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_353fb7f9a276415bb7634405987bdb9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buwosevax/bupotul.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/map_of_50_states_and_capitals.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/xozikovarobujedoranutajo.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_5a1d86fdf2a5452087b5eb94398ac94e.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_bfac947c4cbf4eec94b61fd99f81713b.pdf?index=trueIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_3ca87276080e4b20aee3a42bf0283b5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nimuwet/cytonn_real_estate_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/mabazarotikodolekimojibe.pdfIn PDF document text
    • http://javuxanasojajex.epizy.com/definitionado_answers_level_14.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/payday_2_election_day_truck_guide.pdfIn PDF document text
    • http://tuzererelutido.epizy.com/biology_book.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/chaos_magic_banda.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/thanksgiving_math_worksheets_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 4952 bytes
SHA-256: c6053cab1c50be782a235539e8b6dfc615b6dc341bc118c40464d13e80681eda
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10616 bytes
SHA-256: 67fd00143f4741e166947002089a2f3776d9cf89622b7a0a81eae9f2dfa1d78e
font_02_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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