Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d4e9e80b3d7926…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 09:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d191c053e8b2e8a9f75f68e6bd967b6c SHA-1: 73d5144d0710d55946f6e16e48afdf66f96ee6e3 SHA-256: f6d4e9e80b3d792693ddd28046fdc95bda71aaf9088532db359079d35021edc5
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=skam+full+episodes+google+drive
    • http://potoborotagivud.22web.org/lords_mobile_building_guide_2018.pdf
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/naxejiso.pdf
    • https://cdn.sqhk.co/jumosanex/ltjaHXo/dabaretisofofixikoxi.pdf
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/3921799.pdf
    • http://wegijezunulej.22web.org/free_excel_vehicle_log_book_template.pdf
    • https://cdn.sqhk.co/nopawuwam/jcTmhi6/free_games_casino_world.pdf
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/c50d6.pdf
    • http://wajuxerisowo.iblogger.org/lasagne_sheets_aldi.pdf
    • https://cdn.sqhk.co/zitibidino/ciehjjJ/violin_and_viola_duets_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_2b0ddb644a2d493483c1acd9a5745418.pdf?index=true
    • https://s3.amazonaws.com/fulazelof/kamaz.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_2c9fea1f7331466685891377820670ac.pdf?index=true
    • https://s3.amazonaws.com/xonobijikivo/toshiba_ct-90325_tv_specs.pdf
    • https://s3.amazonaws.com/zonebon/56161168152.pdf
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_3950f4be7c674193be4f1c3daa63bd9f.pdf?index=true
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_123f2099cd584e6e94e7ba264bb14aef.pdf?index=true
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_f630997763a54438b93c8a67f344f4e6.pdf?index=true
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_53bd47948ded4304adde99214e935d06.pdf?index=true
    • http://jaxivaganidira.epizy.com/classifying_rational_numbers_worksheet.pdf
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_414bf2beb3df4bc4a841f1a76def3935.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_f2138d355fe341898768960374b2a5f4.pdf?index=true
    • http://xaposekesudonod.epizy.com/97940910117.pdf
    • 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_off0000f6bc.bin
50ccb0124394e298abd097a749cee3449e4bd1801d9c586bc01e970cbc454b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 5588 bytes
font_01_sfnt_off000109b9.bin
38535c4e5ba6daea065a1362dd0eed00737846bceb06ec8dc027664eed79becd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 10448 bytes

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