Malicious PDF — malware analysis report

Static analysis result for SHA-256 8256b6bc102a7ccf…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 12:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b131a7ba23546d3bd493f87ded78eac SHA-1: 4f64de484cb7e1ec90ab493f47d91f44d574f6d5 SHA-256: 8256b6bc102a7ccfaaa1db992b5725cb76c9cd88265b4fc998c3663610435fd1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=pumped+bmx+4+apk PDF link annotation
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dojidumanizovomevar.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/16907438899.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/75266678985.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/52879343104.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/3554237077.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/wowelapupefus.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/tudatu.pdfIn PDF document text
    • http://videocycling.info/files/file/76794823510.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/58918730133.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/47521579559.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/91171147669.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210916_52A8C7FADDDA8251.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71968957159.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/potopizivuxi.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/64943161828.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/midofisizobavikafolu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202194191435203.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/58553047408.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/95900835915.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/44766817439.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/84801126077.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/18884820679.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/41759946799.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/xerivedidupedelakofojas.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/43167293014.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_off0000af55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF55 16348 bytes
SHA-256: 6465261bd4089853dbdc906f1308bf79775a0e9c3f51c40bc8ed655f37fb8202
font_01_sfnt_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 10336 bytes
SHA-256: 2655aa6a98241854752b9addb88195eb494b0d6242fd2290a1bd40a5f4f6b1e1
font_02_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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