Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbe3042dfbd786f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 15:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f22ac9ba0e8c89067e3e9eeccd27baf3 SHA-1: 5765812d0ab3b0ca2119a1f2f75a2f6c75d5fef6 SHA-256: 4fbe3042dfbd786f7e9d48218c1ca0112430230ad59a898498ef85d019472fa0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs, including one that appears to be an Android software update lure, further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=android+yaz%C4%B1l%C4%B1m+g%C3%BCncelleme
    • http://nbc.ua/design/pic/file/tukopovopale.pdf
    • https://dabanbep.tanglehadong.com/upload/files/zuvifatuboparojeregemi.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/90591167062.pdf
    • http://gernano.eu/gfx/userfiles/files/vojanogolipasap.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/pegew.pdf
    • http://teranor.com/ckfinder/userfiles/files/saxurepaveferenanurefe.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161303ba04ed6c---nujit.pdf
    • https://oancora.com/ckfinder/files/76817080754.pdf
    • http://nscenter.cn/upload/files/gewozazorir.pdf
    • http://mg001.cn/upload_fck/file/2021-9-14/20210914180808846675.pdf
    • http://acsalma.hu/userfiles/files/badumowuwabajakusav.pdf
    • http://studiotravenzolo.it/userfiles/files/67917259429.pdf
    • https://rpaxis.net/userfiles/file/96957972006.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/bopavekakas.pdf
    • http://aldobini.it/userfiles/files/96258539421.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nonakamaziramuva.pdf
    • http://glovimex.com/uploads/ckfinder/files/22509227264.pdf
    • http://nusratali.com/userfiles/files/54732006537.pdf
    • http://abwhopewell.com/uploads/files/sakulavajavetupexidafig.pdf
    • http://candientu24h.vn/webroot/img/files/90081496262.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/savisigegukomaxoxesedoga.pdf
    • http://fukaofoods.tw/uploads/files/202109120035055012.pdf
    • http://plusk-car.com/js/upload/files/likosufokupemovorup.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/sumetosuxani.pdf
    • http://vinmexindia.com/uploads/60469328494.pdf
    • https://gallerylingard.com/uploads/file/69898266186.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21203531088.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0e.bin
e9899e6e52f23f633848fafaa043993cc46bbe77dbcf5f8ba7de9ddb4eb68acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 19764 bytes
font_01_sfnt_off00011e21.bin
c9ce0a1058772091dcbf17bef81421654b30229da457c4367508d55dc8fb694d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 10840 bytes
font_02_sfnt_off000136d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D1 16792 bytes

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