Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae360250fb9585eb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 10:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d183a04adbcd4c06dd203b36c83af3b SHA-1: e54a2a545f8ef3aea6a4a793fafc10d49651e9c4 SHA-256: ae360250fb9585ebe671223d9bbb843e731c76919b60f11562d68dbacb08c7c9
182 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt impersonating Apple. The embedded JavaScript and external URIs suggest an attempt to download and execute a second-stage payload, likely leading to credential theft. The document body, though heavily obfuscated, contains references to wkhtmltopdf, suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://philabc.ru/uplcv?utm_term=among+us+live+lock+screen.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=among+us+live+lock+screen PDF link annotation
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38934528613.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zafikelijetadiwodere.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/sotasamibapixomolu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136017c72494---45643437434.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/wejegu.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/61202894861.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/vilutinizukoditepuge.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/56049475052.pdfIn PDF document text
    • https://loctra.net/userfiles/file/55769931926.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/82894964179.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/lanuluvapizumixet.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/lekuvevusekifubunozapubi.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/tezutilobi.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/jilidejiwuravane.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/43365621697.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/40496507839.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/mulutagez.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/35538639802.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/43865067971.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/zububikopikodaduzagad.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/71025767825.pdfIn PDF document text
    • http://myshalewell.com/userfiles/file/46578392359.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/31476239238.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/jatejepepelogiraxu.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 10552 bytes
SHA-256: 74152bd049271e94e87278ab36980c18a761de8e6b55cbbbaadbaee7c00ef536
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 18532 bytes
SHA-256: 10ad8c091ed9c425439a7efe458553ee0c1dae2e203048156f32e51d1a767e4f
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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