Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25518425c762838…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 14:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96a6b25f058fe5b93e83498d7eb1a900 SHA-1: 0c4d739b469af08adf9b89fa0ab587711cfc7636 SHA-256: b25518425c76283863587a8ba46cd731d9d574d077aa74d3dec7cbec3ecc141e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious websites, as suggested by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://xajibur.ru/wix?keyword=realidades+1+capitulo+3a+answers+page+50', which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://xajibur.ru/wix?keyword=realidades+1+capitulo+3a+answers+page+50 PDF link annotation
    • http://rasezatoxefu.mygamesonline.org/iskcon_srimad_bhagavatam_in_telugu.pdfIn PDF document text
    • http://form-copyrightservices.com/53277696043f7upz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_6031d3b96f9db.pdfIn PDF document text
    • http://javosewo.sportsontheweb.net/lunulajutuxaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fdc376582e9c.pdfIn PDF document text
    • http://fallofelin.online/star_trek_online_biggest_starfleet_shipict95.pdfIn PDF document text
    • http://future-techno.ru/arduino_ide_for_ubuntu_using_terminalkcf0k.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/xarojapi/best_android_for_galaxy_s5.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_159bfe20f1d445548f24484da3139096.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_0ddc53fdfdcf413a928119c9e43d7aee.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_f70da8bee98643b5b2e5cdb92461406a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/86567574138.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_f2cd9f83ccce4d8a816e959981b082c7.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_5babb010ad0e4edd91eb3839b51e8dce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/nutritional_information_burger_king_veggie_whopper.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_fb7df9e6e44340989b7ccc9df306bb3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/microbiology_lab_report_11_gram_stain.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_3d44059deb2d4af3ac818f5e07fa991e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/gold_coast_fishing_report_july_2019.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_b68d2f8418a64895ab5b0fc20ab3c4cf.pdf?index=trueIn 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_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 5820 bytes
SHA-256: 9e71bab06082090ea36107aeca12b415c1a98b83e6cf308ae545bfe7b77a5b06
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 12060 bytes
SHA-256: 8b3b8bf05b0d33044943dbd36d38d2d1f38ed7b99607b07354cb9f0be2ee94e8

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