Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54eebc1d11e6bd9…

MALICIOUS

PDF

53.3 KB Created: 2021-09-28 12:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc1ce853067b17a772e3189595ac3474 SHA-1: a2a355957ec32d8ae5d8b1e7a07fcd38fed8687d SHA-256: a54eebc1d11e6bd9b9ddf63b4a236f5e3dc1594898ed9df1bca29f30dbc90f86
152 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The document structure and presence of numerous external URIs suggest it's part of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the exploitation or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8814

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 53 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://infrive.ru/uplcv?utm_term=fifty+shades+darker+pdf+online PDF link annotation
    • https://hyosung-gulf.com/uploads/file/lovotedamolo.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/57765995829.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/99562002086.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/zonexidul.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/gawivoxunowof.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/61017958694.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/23446053455.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/20316045286.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/93183157653.pdfIn PDF document text
    • http://khocabien.com/uploads/files/mixuzawa.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/sowulupekekiv.pdfIn PDF document text
    • https://subarini.ro/mm/file/75602473574.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/larefofipos.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/81348740758.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/somesabapixajofaje.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/fedomedulafipumudivuw.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/88975438379.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/54995288180.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/78986521255.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/62666171763.pdfIn PDF document text
    • https://uudanbury.life/files/file/67876961800.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21091723521315967363p4yavczpgo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC73 14140 bytes
SHA-256: 9a8d96427ccda6b97d31b5ec453e858cc40b5dd2d1b766ca683a920ba2919ac8

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