Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a573295e91d63ee…

MALICIOUS

PDF

72.8 KB Created: 2021-02-19 00:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e5651595257ffd4287a7b4c67af73b8 SHA-1: 4c876733f05a27a1270509582d25ba4ab8ac8e3a SHA-256: 2a573295e91d63ee67e335a6b42248742170444f18bfe43fdd65d381780a487f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://bologen.ru/strik?utm_term=similar+right+triangles+partner+worksheet+answer+key', suggests a lure related to educational content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=similar+right+triangles+partner+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369173/normal_5ff658f4754e3.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/SVwgje6/pyramid_solitaire_saga_online_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/jdjbjcL/call_of_duty_zombies_apk_download_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/GzTujeL/vitamin_shoppe_cbd_oil_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5fcd3dfb667cd.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/jc9Jicx/40182379303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_6000d96218f2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466153/normal_5fc69eb79221f.pdfIn PDF document text
    • https://losopaxirusegu.weebly.com/uploads/1/3/0/8/130813120/bokusak.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/ifrs_audit_opinion_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389809/normal_5ffe8ce4d79f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://basefub.epizy.com/formas_bidimensionales_ejemplos.pdfIn PDF document text
    • http://mezajunezu.rf.gd/32508900367.pdfIn PDF document text
    • http://juwelaloz.epizy.com/definition_of_birth_asphyxia.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/contractions_worksheet_first_grade.pdfIn PDF document text
    • http://vigevelo.rf.gd/casio_fx_991_es_plus_user_manual.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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 5592 bytes
SHA-256: 5978f19a58ff7850e4d55f4d217389f8b3bb39574cf082828bbc5bad9a726034
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 11416 bytes
SHA-256: 8a63f4dc3ea3e5b2d4f62c5de26005ac66d395a5600f62a4b73fad671b92e5af

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