Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5a0e1b6cb32d0e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 17:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d88fa0425662e2e91cff42c12b2b9c88 SHA-1: c75dbd190b3362f50d8db050843cff83a6153ce4 SHA-256: ad5a0e1b6cb32d0ef3fc0971119f0da36896b27b4eb250acea23c28fe971ce8f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://crewmak.ru/uplcv?utm_term=block+city+wars+unblocked+games PDF link annotation
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/57649951821.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/19313625154.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/32411296000.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/minulusunusexikenesinanop.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/gezokidibopuzulagivagitig.pdfIn PDF document text
    • http://belovosushi.ru/files/73868040408.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e1395f7a---37688486982.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161322862ddcd4---vigunabur.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/42181403781.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vifinaxebizo.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xivifukimijadupo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mawaxofovononematuvo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pezizobokiluwinabewagav.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/60622462840.pdfIn PDF document text
    • http://regmac.net/userfiles/files/14934894943.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/godusid.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/011117573565.pdfIn PDF document text
    • http://leton.pl/userfiles/file/30088410283.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/50430662315.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/21198540327.pdfIn PDF document text
    • https://arerp.kr/data/file///gifopomaganowegi.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_000728.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_off0000c1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E5 11296 bytes
SHA-256: b18ddab0aab55469eec4820ab579bae9ef92b5fb93f760cc2fc82cd310d3281d
font_01_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 17704 bytes
SHA-256: 82f34f4a000904372a94786d2b4227b2abae267e628dd02e2c72fd8777c33110
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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