Malicious PDF — malware analysis report

Static analysis result for SHA-256 327b8e5d9b3291e2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 00:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42d5f0cef8ca66ec42e53e133c90884d SHA-1: d927107dd73e9ed41a7ab61285c40b8684ee167a SHA-256: 327b8e5d9b3291e25bb824b817492316a5d57ae435a86867d1c5e9b690348c0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and numerous links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://archism.ru/uplcv?utm_term=como+desinstalar+um+aplicativo+do+sistema+android PDF link annotation
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143b284a4da6---zesixosimoze.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/nubusuw.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/33873423548.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/56278931759.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/sasirufimunofewedujaw.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/bipazu.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/puviwo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0c99fe2a48aeadf1eb06528b8984e6d1/58446892633.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/vuwisaza.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/magibuj.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/43578842399.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/44198561624.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/63458163919.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/84140311083.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11026027266.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210904_0C631CB55BF5D4DD.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/samixabofetowagaro.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/31341824519.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/17712163774.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xofaj.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/nisakakoraxaz.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/najinivofuvibufo.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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 21232 bytes
SHA-256: 63f76c173810014dd06c6bc8cc70159394300bebf29a42741f6e44424e44d488
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 10872 bytes
SHA-256: e5ec044acfe363626423c814b80303800b0821931df2d7266f2c350a48bc86fc
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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