Malicious PDF — malware analysis report

Static analysis result for SHA-256 3762e2cec3ee9bd6…

MALICIOUS

PDF

67.7 KB Created: 2021-02-12 03:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b252abd3ba7ea8dd2033832bc6bd11c1 SHA-1: 31ab86400ab45dae19e9c76011b75734e8b5d62d SHA-256: 3762e2cec3ee9bd6ce2728b4aa1db6871b87c109ee98a20ba639dd5b4c853d69
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 0.9998

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://baarspo.ru/wix?keyword=one+friday+morning+questions+and+answers+pdf PDF link annotation
    • http://golulim.iblogger.org/lsil_guidelines_ontario.pdfIn PDF document text
    • http://wide-mean.top/wodipafux7q62k.pdfIn PDF document text
    • http://1eyvgo.xyz/jelutong_wood_sheets0gpdu.pdfIn PDF document text
    • https://wegidakalulat.weebly.com/uploads/1/3/5/3/135337254/sufiwo.pdfIn PDF document text
    • https://bujubilefo.weebly.com/uploads/1/3/1/4/131406518/8337421.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/tuvulexuvegopiral.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/9d1187eb0de9a.pdfIn PDF document text
    • http://eferevole.com/27256520315lir5b.pdfIn PDF document text
    • http://mastera-saydinga.ru/converting_between_fractions_decimals_and_percents_worksheetbgxcc.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/gowupuzokowuxes/kaxodinokabojuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/spreadsheet_compare_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/wodozomo.pdfIn PDF document text
    • http://wanuzenupikow.rf.gd/met_cycle_helmet_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/topatoxadimigunokikonata.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/manychat_chatbot_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/loan_agreement_template_uk_word.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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 5676 bytes
SHA-256: 882f846b5f82b3ed61f7d5d95ed019c256377633e7932773087707cb376167c9
font_01_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 10128 bytes
SHA-256: f3ffa5f198a422c655c35202796fd17902705d487a13d4326a9caf9176eca007

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