Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34a9b4c56d7f451…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 07:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c777ee8ca630a34056e4b4a78a9e0b5 SHA-1: c4e8e3b5ee829a21c3b2330459a66e9019c4710f SHA-256: e34a9b4c56d7f4510ebcd82c1815fbdb524789e7d01959fc427d0cfd7bfbe0a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware delivery. The document's structure and numerous links on disposable hosting further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=binary+xml+file PDF link annotation
    • http://jinistudy.com/_UploadFile/Images/file/97697371828.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/401860935.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/69738291641.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/31209995723.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/63871552966.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/1188697665.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/lasazuwowukewifabifak.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/69796935571.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/namiresapiko.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2a2eae0c06882b7fc1e359341446d17b/xagetow.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/48587010634.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad29b86a1c---tuponudorafepeg.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/90724217686.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/dowaro.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/45922971714.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/84638454389.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/62476156903.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zukizatonuk.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/sekamesal.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902214716_xrcx20.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_152008.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/95277705344.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/35737678755.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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 17636 bytes
SHA-256: 2de5e226afb4eaea3b5019fa9e724fb9f76b4048d300fab85c792d2a226db431
font_01_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10256 bytes
SHA-256: 778be50cea52448c6e3543589a638c6e51134bda8b50fd080964a8c556524252

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