Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b038cb2707b8d7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 04:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6188fb8ea684dee7a6c169525e16fa65 SHA-1: 41546902ed90a4126ebf48aa6fb81dc234ad3862 SHA-256: a5b038cb2707b8d70a25d449a1ecb1d4ee67f829d1ad1a86826bec5249c8610f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to link farms. The primary URL suggests a lure related to 'roblox code generator robux', indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=roblox+code+generator+robux PDF link annotation
    • http://laros.cz/UserFiles/file/39681916390.pdfIn PDF document text
    • http://findusafranchise.com/files/files/55084287008.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/napunepo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mubopozogiwajogus.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/sitirumadijop.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-4/20210904114906797064.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7520c2b4---tekuvobisilokitobigo.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/15899180423.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/67330248525.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e42a6c5e---4866837648.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/bexobumirovuwomalo.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/jutimijotoju.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/miboja.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/losavifokov.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/dagaz.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/37403493881.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/71278293974.pdfIn PDF document text
    • https://davnosti.ru/upload/bonamonerivix.pdfIn PDF document text
    • https://bselink.com/userfiles/file/tedumazawugusuvifes.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/zakonedovu.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/xadelamitavixisaniwediw.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/lidinegugafififat.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pilisopugedokidux.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 17688 bytes
SHA-256: de44b0079c342cc89a794b4cbd7bc3e4068a6e3baaf89de6639c07a0cff21434
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10672 bytes
SHA-256: a4d67bebb6f0ca683ed653bba9e95a7635efa362df2791301960db48b63535d2
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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