Malicious PDF — malware analysis report

Static analysis result for SHA-256 4254a3e344814d1b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 08:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f18a295f582711b04ee17f156aef02a3 SHA-1: 79d25a46595e517fccc3bcbdca89cdcf172233b7 SHA-256: 4254a3e344814d1bce9945c765b9a7de8a26be679d85792f663e7df218fd057d
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a visual download button and the overall structure point towards a lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=the+best+n64+emulator+for+android PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/zixosewumunogomenane.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/zakujokebakosunuluvaragi.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/roxelofunagowarula.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/lawelovesenenugudimoru.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wojoxarojitazabir.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3d50879d884faf14ca5723da2209a4e9/14953054414.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/30652892481.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/kegepafazakomupenavizepa.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/powomudaserewerinu.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nabetanegigujanubu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/demiketamulozine.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///88377782960.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/18881473155.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109110537211624268v5uoo.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/63809771712.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58ef0cf0e---89601322697.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/25321410277.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/juxazemigiladin.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/worenavomudoketatejis.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/60129740150.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nawamunorodosinatisurajip.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/vakazubutagok.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/98069107030.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 17312 bytes
SHA-256: bcef98d7a1b26f62c65ada64c13eab6f86ee0f386ab33c06d15288a9e5858a3b
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 11068 bytes
SHA-256: e324d1a11f96a0438908b7c3edb875e0b7c27403e671093ba518f9ec25064947
font_02_sfnt_off00013aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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