Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb499fb413b363c…

MALICIOUS

PDF

68.5 KB Created: 2021-02-23 22:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d2b9e46e79f9426b89f5c6a68d629f6d SHA-1: 997d8c153e2500aa42d0d08e296f37ee66b7ac0b SHA-256: edb499fb413b363c13da22317cc4bebc633d9a2cdc59da24ff96c1c3f6f095cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9998

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bologen.ru/wix?keyword=quote+sandwich+worksheet PDF link annotation
    • https://cdn.sqhk.co/novitovikor/hiR4Ugd/55299676512.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/d55a74.pdfIn PDF document text
    • http://yourbigdick.space/dezikamariv6nm9v.pdfIn PDF document text
    • https://xubawiki.weebly.com/uploads/1/3/1/1/131163512/ramalozanedu.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/e0e68c17e7e.pdfIn PDF document text
    • http://lassituda.online/bbt_bank_locations_ohiohpmvt.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/62657.pdfIn PDF document text
    • http://distornyup.site/integrated_korean_workbook_beginning_1_audio5ru68.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/legenapi/fowobu.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/guide_rock_high_school_nebraska.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/adding_and_subtracting_fractions_common_denominator_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/bosch_dishwasher_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/joberubinemovozobalivetuw.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/angularjs_form_checkbox_value.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/52207394515.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 5212 bytes
SHA-256: cf81ed971c55480734c3926d10e726ab03d5b4bc826a1eae78638899b32eef91
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10184 bytes
SHA-256: 6deddb8d3f28590248c0318c9486d2b18a5fa9e363269426cccabcfdc78b46c4

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