Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc88de6d57e3d8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 09:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df78412b839a23711d5c5203e570cbec SHA-1: 8e252be9c581accab47b7f605e9edad197e1ffdc SHA-256: a2dc88de6d57e3d86c34916c952b7a519b4f024fae010f7aa1fb39311178861b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=fuller+house+123movies PDF link annotation
    • https://ginniglobal.com/uploads/file/rozomuke.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dasadurofowaridesuxebagu.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/fubikarut.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/71287177261.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/sobixuzemovefeka.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/koreden.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/teregolamafeta.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/xuxezulefug.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/vududodozajoxasara.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nifawelerupubojekiwetum.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/38797699627.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/fuxinizilotekesezanefix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb61ad64dc---vukozusabaluk.pdfIn PDF document text
    • http://attlas.center/userfiles/file/21158901561.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/zikelorexubatovito.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/pevubefirefav.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/bopabonumunugokixuxime.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/93487955690.pdfIn PDF document text
    • http://japhina.com/upload/file/45592103191.pdfIn PDF document text
    • https://tl-systems.hu/files/files/11515067519.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/xakov.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/dujijibi.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_82D027FF2502D11F.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/72827311033.pdfIn PDF document text
    • https://micsys.in/userfiles/file/18826162754.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_off0000b4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 15800 bytes
SHA-256: 6146e586ae972dee12d1f5a1e9e95b2cbd11236b73e058cca06595c5577ad90b
font_01_sfnt_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 10496 bytes
SHA-256: 6bce01a6d7914d287c2be728f89bb6279824af2ece6ef3b1478526ff4839d014
font_02_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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