Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9de41e09f2a0fcb…

MALICIOUS

PDF

73.1 KB Created: 2021-09-29 06:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c25e7499af4dd082c98bdcc965271b9 SHA-1: fcb8267e5c09728ca1103d3d44859a4b9089528b SHA-256: b9de41e09f2a0fcb96f03d1aae5aa36d0129212e35cc184a694e13bb32db05cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous distinct hosts and links. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=mac+os+emulator+android', likely serve as lures to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://synerhu.ru/uplcv?utm_term=mac+os+emulator+android PDF link annotation
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sojinewuvokerupofajoja.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/lopapovegaratofunudibor.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/roxijutug.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j8jie02p1nesgspk6k31elkc80/61035926403.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/41508898762.pdfIn PDF document text
    • http://markone-tools.com/upload/files/saxabalu.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/xogolavopevimevotire.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/bufivanena.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/36053678602.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/dikadotote.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/65411293119.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/12139901278.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/vazoj.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/lagevovazavir.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/kepip.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/41116985311.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/xejusukufokovemamanuzaga.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/dimumof.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/21498426706.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/86423573465.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-24/20210924190225979986.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/tetorapifixaj.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rameluma.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/remosekokekepenujej.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/lowabusamijutad.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 18920 bytes
SHA-256: cd33b8cbdf61f077eb6a0e98e18d2dc019cf89ca7058c767be16cd617c947ac0
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10624 bytes
SHA-256: 63aa20bb1b6b3e2ba13d8131f68b5ceb67f7ba9d644bff94364f35b9d5e0ad4d

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