Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e59b19e79232f6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 12:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3baad56a565d564aaf2f8973109c80bd SHA-1: 790d8601fb2b5cc8dc5b756112d469aa4d0e1533 SHA-256: c9e59b19e79232f61445646fe6703e39368bf5c839449609c9ce26a734712995
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute actions. It also includes numerous URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132529cabbd0---18312787571.pdf In PDF document text
    • http://papianiarch.it/userfiles/files/5506888463.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/vubujijaxaxafoxuj.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/58559070444.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/13239124582.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/48533850169.pdfIn PDF document text
    • http://land89.com/ckupload/files/pikabake.pdfIn PDF document text
    • https://triosms.com/userfiles/file/19050169492.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kisalijikozipoxijoxo.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/nexutuzokawujujijeg.pdfIn PDF document text
    • https://hotelcorona.ro/files/rored.pdfIn PDF document text
    • http://ashioke.com/images/library/File/52357584607.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dunujegusezonakeb.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/80790642866.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/27659769612.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad2c8981---37399592643.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/34327636711.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/39479465342.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/desababexanudiluzizive.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/20410871730.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/81158355158.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/74032125363.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/18711484232.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/83567251077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+stop+charging+while+usb+tetheringPDF 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_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 16652 bytes
SHA-256: 2ce2950cd5acc825ebefa03f8cbcd7217c01a69f92fbdbfb6086343f0cc22f26
font_02_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 10968 bytes
SHA-256: d065d4b5e9cdbbb169f7ba3d869688d0eed6d9863c162cd3d37ed47a065576be

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