Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c8914f4ff662f5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 04:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97a872f27112227886cd26aa68015d32 SHA-1: da233355c8eac59710178c94b9de9f635b92b326 SHA-256: 84c8914f4ff662f53a65fe7d8a90c7347541786a2af86ece41b730e7cc813bdf
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 link farms on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://96stone.ru/userfiles/file/xafoxa.pdf In PDF document text
    • https://bloc-immo.com/images/pabano.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/zekiki.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/70419017091.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xulusotego.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/10031604614.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/35994752385.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7979a86b8263be5afef465658f0fcc0f/xajiwilolufebukisajugu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/lebateriduzo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f783deccae---geguxefavalipigoguwif.pdfIn PDF document text
    • http://jsdarvin.com/files/libajanipekoketemedu.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/96899589956.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/71345122731.pdfIn PDF document text
    • http://4bx.pl/public/file/7971165970.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/75193448718.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108312229266648.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/takazejopalilaga.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/nozufuxorexapajiwisiwuk.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/83421064917.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/74650496000.pdfIn PDF document text
    • http://gazetavk.ru/img/file/41886543939.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/sipikujubafun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chaos+rings+iii+apkPDF 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_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 18008 bytes
SHA-256: d3c28213ae2d1224089189b7e4ba2b364c132e3b8c62a24121a27e84ce0f2567
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 10376 bytes
SHA-256: 643f07be840887a0d64054a06a04f7df21ff6af837466276eedda9005a22b0b0
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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