Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1941e1eaf6ad4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 17:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 497a5b2915e87c8d0cd2c8d14c39641b SHA-1: 7e77cb145ac12dc8c40d85d73393e3d9b1b4588d SHA-256: cff1941e1eaf6ad4319619d111f060b4074b5c0853e00123a14d64ab456372e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also includes numerous external URIs, some of which point to potentially malicious domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://savoie-outils-coupants.com/ckfinder/userfiles/files/jigapixoborakugigewafek.pdf In PDF document text
    • https://resicolor.com/upload/files/zuxinolarenukowareni.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/49929394734.pdfIn PDF document text
    • http://flexa.cz/docs/file/soresawitopisalotopadebi.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/norawisi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfc963e12---83753039117.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kalabazunorapebotaluxekab.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/tijoful.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/90213541773.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pq1deskpict3t0km9qusiu2fa2/fisopisejetijaperibiber.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/78721553055.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/61603105632.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/jizatarane.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/jiwipiferezoliwefizoz.pdfIn PDF document text
    • http://idroter.org/userfiles/files/wosovapukonofolul.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/wiputevomowatudeb.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/tuzeferiraxun.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/63995667243.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/95817636469.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/70087016206.pdfIn PDF document text
    • https://artbynela.com/uploads/file/69616805333.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/godalazi.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/tutaliforabobasonakomalof.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/40812333357.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/loram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wifi+password+appPDF 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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 10192 bytes
SHA-256: ae15182335caee24f9eb4b55749a6db26d47c4c3eec4a2ea79e103b7faa4fbb2
font_01_sfnt_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 15600 bytes
SHA-256: 6322d17c758b32ca5f4dfc739667c98c130016dede7463c6294dae2cf7f3b42e
font_02_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1