Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86e87a4c997cf0e…

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 17:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d4b7f5244757a003590c3d16bb0377fe SHA-1: 9cb5f41407cd8c8b855d3dad8fbe7170d4b4b13d SHA-256: d86e87a4c997cf0e8c14257466c8a6fff73762246d8d2b987053b2641e1ab2a8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/aws?utm_term=gigabyte+gtx+970+windforce+dimensions PDF link annotation
    • http://detonic-buy.website/allu_arjun_photos_djna2yh.pdfIn PDF document text
    • http://stassikorskyi.com/minuet_in_g_beethoven_violin_solouk0y2.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/zetubakuz/acknowledgement_of_debt_template.pdfIn PDF document text
    • http://lafurunun.rf.gd/juvilujegelinuxi.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_2057d81dffc4419e8c39877f06f690b9.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_28dab28569974adfa7927bd7685d0631.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_e5f7a98507bc4d23a07320b15ee3abd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/mafifetitadimajitunakiw.pdfIn PDF document text
    • http://boxitevu.rf.gd/how_to_analyse_compound_words_are_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/99363582046.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_b74d4f7140394ff4b705e2065850c85c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/format_html_vscode.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/a_prayer_for_owen_meany_summary_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/xodifebof.pdfIn PDF document text
    • http://kavexuvosa.epizy.com/stem_and_leaf_plots_answer_key.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_aa6a9413ee65422fb439b5fd023b3fd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/pioneer_mosfet_50wx4_set_up_menu.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_d757c2d467844787bfdc16f7e2788ca2.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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 6120 bytes
SHA-256: d2f6cb00208835e2c7314aab51c9d8fe2d421a37a483f384c64cd1f783d7b627
font_01_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 15552 bytes
SHA-256: 5ff4e2f96cd0b1aca11129f17f803511283aef35de02fa8a1feba5353b1ea178

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