Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f332eb45e32b9fb…

MALICIOUS

PDF

77.4 KB Created: 2021-03-06 04:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 895c615188e9be51f67b8f3365167e84 SHA-1: eb02c6814739157ffd178bf6186ebc3a453f6db4 SHA-256: 6f332eb45e32b9fbddbd9563b090b9ccd92ed14974e935002f8f41511c8a22da
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, appears to be a lure related to educational materials, suggesting a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=saxon+math+kindergarten+printable+worksheets+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_6000e4a9a5a07.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jgdUgk3/adobe_editor_free.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/bnuhhji/space_wolves_codex_9th_edition_vk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_603532e588f68.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/85316318165.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/m_audio_oxygen_25_3rd_gen_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/gfFN4VF/potter_puppet_pals_harry_s_nightmares.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/Piijji1/54512670574.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/77876773993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_6039283c8281d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_60324d4e31991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fea0d85d3e04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9724ed-0ed1-47f4-aada-a9c50fbe191a/ratomupov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf05a47-0bf6-4062-b431-b7a66b7d5a00/xibifezubovifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbeaac7-5aeb-4b3a-b55b-235b6fa286d7/bbc_english_grammar_book_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/72011899338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b617c1-66c7-4f03-8b51-ab46bc55e495/to_the_woman_i_once_loved.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/adobe_acrobat_reader_apk_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/paligili.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/what_is_the_purpose_of_the_armor_of_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94393014-868b-481d-a08c-351fe23b0894/rokunonozikaman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab70b43-558a-4f9c-92fd-50664c5da32c/13778772349.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/17047826649.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/las_medias_de_los_flamencos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c729f0-686a-4f57-8d01-7717bd38b471/how_to_mix_nason_ful-base_paint.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/jammu_university_b._ed_reappear_date_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef007b3-eb0f-4e78-a3e4-3749daaa173c/5735002960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4313f0b-9f02-4afb-9ab1-bd186376366a/37925427399.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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5924 bytes
SHA-256: bedbc7bac325078d1e2f69b3fe7ea270a883a68afe6446bd3dbee19a1b0b323b
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10668 bytes
SHA-256: 7f733b30811dda3ed4db9dae5c734fd6cd132b8ca86659e9d1feb69f8e8a6c62

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