Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee17f7c8978f8075…

MALICIOUS

PDF

77.1 KB Created: 2021-03-28 20:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c5a6e9c1a6fac1b88399092a041b06 SHA-1: d7d34a7259abd08aee944b480c299822eae6098a SHA-256: ee17f7c8978f8075a17755884994a19e783ba953efe03122462422379c46491e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=is+a+shark+a+mammal+yes+or+no
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/6106248.pdf
    • https://cdn.sqhk.co/wotinobeb/gehetPL/bagazumegojojapifulobow.pdf
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/vetok_xesanalesifokav_wozar_jodomogom.pdf
    • http://rekugegik.scienceontheweb.net/610_tractor_for_sale_gumtree.pdf
    • http://leninuludobodu.mygamesonline.org/17529602047.pdf
    • https://cdn.sqhk.co/monazaxumol/aFOlhdI/lesemiridu.pdf
    • https://cdn.sqhk.co/jifedibodo/jbijChb/ios_app_store_apk_for_android.pdf
    • http://xunetokawetik.sportsontheweb.net/kalejukupopagapege.pdf
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/vurenozaf.pdf
    • https://cdn.sqhk.co/livaxipovage/jhgjSja/nazesasaramosi.pdf
    • http://wejaduz.mypressonline.com/miwokozarisobonofu.pdf
    • https://cdn.sqhk.co/xawobovuji/lgeDGzJ/cells_alive_webquest_answer_key_part_c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_7a70121beb2a4ee89166fdbbda7ac155.pdf?index=true
    • http://bifovigavij.myartsonline.com/carmilla_story_book.pdf
    • http://rumadedixigiwu.epizy.com/convert_arabic_number_to_english_in.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_69f043a33e084e289df38cea4e649f40.pdf?index=true
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_6a6ec491bba947b2b1da48740760b63d.pdf?index=true
    • http://tebimanapedupun.epizy.com/ic2_kinetic_wind_generator.pdf
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_5cbf98fb7d0f48c190d24c8da37d3211.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_5d1c88ffbf19463498415d1f4251b4b1.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_off0000f2dd.bin
fde3bd25f1fa03424c7faf8f9b1fb779c06232cee0d911259ea0260b6aa305a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 5028 bytes
font_01_sfnt_off000103d1.bin
3860199f99af4c1a52e6d59cb9a75945f4b3eef67019e351ab8ce54f5339ea21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10376 bytes

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