Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f36b28cedbe669…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 17:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54e0e561de03609fdba03dec5381b62d SHA-1: 9f7e8ece72e19103be62ecda6531882f93d320f9 SHA-256: 90f36b28cedbe6698ab7a0b4a18c975e8618b9465c602e9bb9ac9c0e5876d5e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=unzip+file+extractor+apk PDF link annotation
    • http://saigonford3s.com/uploads/2021-09-15/images/files/98443616135.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/12798619743.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/pumerinuxuxujewojafap.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/71795110036.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/rogatudu.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/jofuxefimu.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/tirifawobowodutaf.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/rosoxixa.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142007f0b8f5---fetekikolixozasoz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614857acd391a---13783599120.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/vilunowujozilovere.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/78726032494.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35698441430.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210918114511.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/46608161881.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/35293323332.pdfIn PDF document text
    • http://telektrans.hu/editor_up/97467528898.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/botakiforagebipi.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/betixujo.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/35375428189.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/jebenet.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/feveluzoworozevifo.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/90802531897.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_off0000b58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 16732 bytes
SHA-256: 6861b39195c031b051c8cf32bfbfba99b25b31a9199bc85f0edfc2766acbf986
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10564 bytes
SHA-256: 372c58123b470396201fe6d769ae78c4196c0cfd9419adca4a736ddc898fc423
font_02_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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