Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1af0fbe49813d7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 18:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 092db875c33d680a9e96f679b8911463 SHA-1: f249cea3e282f13ad8d4a8bde8b641109a32f518 SHA-256: bf1af0fbe49813d7619213641e3dd1d55fa2c2c4c43f7bb704880b799e4fc229
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL suggests a lure related to downloading 'Roblox unlimited Robux', indicating a phishing or social engineering attempt to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=download+roblox+unlimited+robux+mod+apk PDF link annotation
    • http://kuppersbusch.hu/userfiles/files/gidix.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/27599897026.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/19363617188.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/19270247169.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/lekezokimuzujebodegawumer.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/66392409057.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/81943246898.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/37922415102.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144a2d07470a---wimogomaroziturunuba.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dajolatitowuf.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/17774835070.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/detosafasirugoniwizis.pdfIn PDF document text
    • http://finchamauto.com/pics/56026024945.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/117195718.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/biner.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/fizanukosavanif.pdfIn PDF document text
    • http://hopkim.vn/upload/files/tewafupuwewazex.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/13782180137.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/65899545281.pdfIn PDF document text
    • https://cet.sk/res/file/52400017106.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/deziz.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xiraxiwaronolavimupimi.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/jidozologo.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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 10904 bytes
SHA-256: c156d15be2bdf1e4673f399096a5619f6f12b9c4ec205f20c59f063bc85aec96
font_02_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 17204 bytes
SHA-256: 3e852136436ac751bed1d80e13aadc82cfb985db9b53507103b7c1470d1fc8d4

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