Malicious PDF — malware analysis report

Static analysis result for SHA-256 3944a9e31e3b6b4b…

MALICIOUS

PDF

71.3 KB Created: 2021-04-05 02:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1acce4342c4257f38e89f804b25f7667 SHA-1: 7d7e474b33c32c6ff2bef885782846c00f5c0abf SHA-256: 3944a9e31e3b6b4bc3b649ebe447fca00d72a2ad0c140f67fcca8570834c98a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing. The primary URL, 'https://kuzutuzo.ru/wix?keyword=isosceles+trapezoid+in+real+life', suggests a lure to a malicious website disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=isosceles+trapezoid+in+real+life
    • https://cdn-cms.f-static.net/uploads/4385435/normal_605959893393a.pdf
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5fd15a7e75115.pdf
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6016b4e63dc1b.pdf
    • http://goldenframecollision.com/norton_field_guide_to_writing_5th_edition_online_freeatdzt.pdf
    • https://cdn-cms.f-static.net/uploads/4422877/normal_6043e893bb326.pdf
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5fc9159a36085.pdf
    • http://fitness-ital.fun/what_cleanser_is_good_for_fungal_acnex3bhb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebba29ef-4420-49ba-86e5-8f74a1637b0d/wages_for_housework_uk.pdf
    • https://s3.amazonaws.com/pozokimepe/47284676119.pdf
    • https://s3.amazonaws.com/desekusoxi/somatic_cell_culture.pdf
    • https://s3.amazonaws.com/metubevozisul/witcher_books_full_set.pdf
    • https://uploads.strikinglycdn.com/files/feef09ae-9925-4b26-ada3-f50c7d3b9b89/how_to_meditate_tibetan_buddhism.pdf
    • https://s3.amazonaws.com/baxunaf/in_the_realms_of_the_unreal_word_count.pdf
    • https://uploads.strikinglycdn.com/files/85f8a759-85bc-4325-b272-59d8f042f1f6/la_divina_comedia_el_paraiso_resumen_corto.pdf
    • https://uploads.strikinglycdn.com/files/b1d2f1b2-0baa-4944-a3c0-337e4f03cc8b/binajarajominuvusenig.pdf
    • https://s3.amazonaws.com/poguvelefa/free_binder_cover_templates_for_school.pdf
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_3aeff269345b404f882141e7632926e4.pdf?index=true
    • https://s3.amazonaws.com/zizene/what_are_the_approaches_of_literary_criticism.pdf
    • https://s3.amazonaws.com/jubiferekaka/carcinoma_de_lengua.pdf
    • https://s3.amazonaws.com/gonasidupij/jonuvemimatabax.pdf
    • https://uploads.strikinglycdn.com/files/18b0cd08-7ca9-4b34-9288-f4716ffdf42c/is_agile_always_better_than_waterfall.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_88705d38de5b4a9a86e90c5021bbd33c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96f.bin
ba71b94e047707afec88fbea457b6140ad555042f3acea6499f26bd11b6f8f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 5136 bytes
font_01_sfnt_off0000eb03.bin
57f4b38a0f22e58e62ce3beabafbccad52b58c0a7f17796421837d40e5a7c982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10860 bytes

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