Malicious PDF — malware analysis report

Static analysis result for SHA-256 8479dbd31677c6a6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 14:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d588eed2203f0306b0b94271d0f41d9 SHA-1: 11e76b49aa449602b3239373587eaeec752fd515 SHA-256: 8479dbd31677c6a6c0ffe81ab8f96a5ee6ecee4bd61b8dbd386ce8d6a52f1f70
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. 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 executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://maciejabramowicz.pl/upload/files/file/39305417386.pdf In PDF document text
    • http://okvin.org/userfiles/file/lipofumijamixojajalum.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/78208052330.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/jogigedemunigixanaxox.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/67524615506.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/vogixuvedabunopivebofuwup.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/65550098759.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/65197212300.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wakib.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/2614040555.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nineju.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/lumadimur.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e17f527de360971b019f35a0a25e21e1/mamowezowaxubisodafelisu.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/bujenuleni.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/difuredoduzakurukojesot.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/gaxozufavozafanas.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/30190002704.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/3192303867.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/9398632718.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/78792963663.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/sarifevamijatewiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+android+auto+to+carPDF 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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 18208 bytes
SHA-256: a08c49ee565c6a399c99c428e56e1d0da9f7b07ec324ea9aed80a08b04da0e44
font_01_sfnt_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 10328 bytes
SHA-256: afdf55e3b47c3916f17be2468af7742778b51fb5e850a4aba87a995eb9064933

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