Malicious PDF — malware analysis report

Static analysis result for SHA-256 420564640460ef71…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 12:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 917d6799b919d4460829e1a102bf64d3 SHA-1: 635d6ddbb5628219efcb78fe8016884a810f8bca SHA-256: 420564640460ef71e1b369a5fcafae7bf665eda2454cc0e1f90bb65dea28b4df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://drxzhang.com/userfiles/file/gakuvelidazivajokufo.pdf In PDF document text
    • http://aromata.ru/upload/files/22296283282.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/89551474585.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/7113610217.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161372a5c28c1d---3865557658.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/36443393872.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/83233924733.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/53110381943.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/tibedojapewuvatawimuf.pdfIn PDF document text
    • http://rld-carbon.com/file/butidijuvexikile.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/mazulupixarulokebegokufe.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/87908458458.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wiripefadipiziwefoju.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/98602545508.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ccedad587f95a5007eab8649ee851d6e/49035530980.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/41489808909.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/bejuf.pdfIn PDF document text
    • http://mq-water.net/upload/36101567482.pdfIn PDF document text
    • https://hsse.cl/files/lozit.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/zepisikuxe.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/34507353443.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/12539650965.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/45555738536.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/43797894022.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/lazuzovos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hello+neighbour+hackPDF link annotation
    • 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_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 17896 bytes
SHA-256: 888a286dd69c9cd1335049e54b35553022eadad7d8fb261890ed6d6ceac9b47c
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10568 bytes
SHA-256: dc8ac84aefa5de9a88aab8ce713ce055117afcf72bafcf96bded0b21a467cb54
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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