Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec586e3fb076c100…

MALICIOUS

PDF

138.1 KB Created: 2021-03-23 17:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cf0d55926ac30f5eb9c27c2e49580749 SHA-1: 5823c2a6149b718837113bce43b23bb1729ff066 SHA-256: ec586e3fb076c100a4fe5e22236ae5a817d838072b809f53512011f30ce69cc3
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 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/wix?keyword=%25D9%258A%25D8%25B2%25D9%258A%25D8%25AF+%25D8%25A8%25D9%2586+%25D9%2585%25D8%25B9%25D8%25A7%25D9%2588%25D9%258A%25D8%25A9+%25D8%25B9%25D9%2586%25D8%25AF+%25D8%25A3%25D9%2587%25D9%2584+%25D8%25A7%25D9%2584%25D8%25B3%25D9%2586%25D8%25A9 PDF link annotation
    • http://vonezejavej.22web.org/disability_support_pension_centrelink_form.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/vexeliku/71140751030.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_aafc3e4ee94c42d08e65f71f289e44b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupimaral/86517278482.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_0b7832855084470c8f67a981dfd94feb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/betovesoxufivakuxirobe.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/workbook_3_answers.pdfIn PDF document text
    • http://pagulixerus.epizy.com/autocad_2020_learning_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/53672528339.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/architecture_students_presentation_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/fisher_paykel_dishwasher_manual_dw60csx1.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/how_to_write_the_date_in_ap_style.pdfIn PDF document text
    • http://jogufek.epizy.com/mopupuwazuje.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/cd_android._gradlew_assemblerelease_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/favicon_in_css_stylesheet.pdfIn PDF document text
    • http://welokaj.rf.gd/jidimokugujufelotifif.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/36386241988.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/38672952819.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/sufuri.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001dbef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1DBEF 34532 bytes
SHA-256: e2cfacf5703ef7a597b5b17554023e913ae68d52289c1da635ff666b08a6e88c
font_00_sfnt_off00019121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19121 4068 bytes
SHA-256: 9093d88ed2f51c078dd44114aa35e5641b1c3a839509d1d398fe9e3f8c83fed2
font_01_sfnt_off00019f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F00 9452 bytes
SHA-256: de2d0966ed118a3a5c93d1a07fada6880cbec79536f1415ac18f2caae9b1225e
font_02_sfnt_off0001bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF97 18108 bytes
SHA-256: 48f6d4c7469bad196dd52db9ef18d1d50350a7805d3b4294eba2f3a7f61f2c5d

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