Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f8c28236b8253d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-08 02:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a5d081e376b340bc5d318f839fabe5c SHA-1: d7572461771972862869ef352dfb7fcdfb0b0f22 SHA-256: 11f8c28236b8253d1819e103d27b8067ec3360c22baf359a3b78228389a6614e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/award?keyword=roald+dahl+short+stories+for+students In PDF document text
    • http://tonedomopoja.scienceontheweb.net/18315709576.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/51762437228.pdfIn PDF document text
    • http://sarkife.site/trenches_definition_business9cnj3.pdfIn PDF document text
    • http://webcam-model.online/what_reading_level_is_dog_man_fetch-22eq2mg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_600e5a026ac9f.pdfIn PDF document text
    • http://mosquito.codes/supikugogorubolanozotdh8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fed921da476d.pdfIn PDF document text
    • http://maykistore.ru/aquatek_100_manualva2co.pdfIn PDF document text
    • http://storeeuro.info/zekevubuxurugivopaveduzm9is.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_603889b92d74e.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/dixaleko/saskatchewan_archives_online_enquiry_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/44547658751.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/35858056173.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/andromeda_substratum_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/esl_second_conditional_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/vavuxesupubusalove.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/lumishore_underwater_lights_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/business_english_lessons_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/28878072974.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/nikon_35mm_1.8_fx_vs_sigma_35mm_1.4_art.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_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 5000 bytes
SHA-256: 3f42e8eefe91a46420ebea9a208be63a91ef877cdbe4745b9752a1134921005e
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10680 bytes
SHA-256: 966d6b6b9ad9441d3e38d0c58d0d2bfe96ea0e9c9e1b798973f934130c312924

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