Malicious PDF — malware analysis report

Static analysis result for SHA-256 996dbc2e70b871ba…

MALICIOUS

PDF

59.5 KB Created: 2021-09-26 13:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a73149c0b7001a7f31b5b8c75750cde SHA-1: 82708e041f8f90f8ccc96d269d317e2aa39bb66c SHA-256: 996dbc2e70b871baa69ff598bcf9f2d40fcf86407cbeab12827a445300c6272c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8395

Heuristics 4

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=task+manager+android+tv PDF link annotation
    • http://thietbikhachsanvinhhung1.com/upload/files/jepifuvanuxunewevalejogiw.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/ruviropinokodukoloziw.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/58241457086.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/543765013.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/rimukujobipabuz.pdfIn PDF document text
    • http://dsraxys.com/uploads/22170232514.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/40989299622.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4d854fb8---90137128867.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/54026491276.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/sogagukamafalob.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/39519219587.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/zomezurevejafaweniduwum.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cc7434bc93c6d587fdfa56cb7649ead8/60647363834.pdfIn PDF document text
    • http://hk-keber.de/images/file/9628441065.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zezefadegaseduwaf.pdfIn PDF document text
    • http://sunway.me/uploads/file/080914147483.pdfIn PDF document text
    • http://partnercable.com/files/71039206624.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/69692184021.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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 18336 bytes
SHA-256: 82bb96425ad95a291a651a3a5f30c89b7f221dc43991ec0418a800f34d518d81