Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20f1e010febc630…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 08:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce3e5351f89fe08e8011f9347f1ae213 SHA-1: cac7393575400d9bdc83297196fc3bdea4a05bd6 SHA-256: b20f1e010febc6309deedfb14cef4bb483d8b7266a7a095ec3183b3791abc20e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://madiagranitosilano.it/userfiles/files/vetezeba.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/35806539308.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/kafikimasexiwoluk.pdfIn PDF document text
    • http://sunway.me/uploads/file/100020242149.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/61728939066.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/28988314006.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/49201339299.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/zedamigolenegodo.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/nidakan.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/18241497110.pdfIn PDF document text
    • http://africareview.in/userfiles/file/34759481656.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/xiniluwis.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/47774301433.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/54704876395.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0be8cb7c1---27870047481.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dinefalisa.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/dinib.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/fikosikukezoxedusewifimas.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/94899832843.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/lugumosaz.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/89635857025.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/xegabikovuno.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/18367319666.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021911852137592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=days+gone+game+download+for+android+obbPDF 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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 10940 bytes
SHA-256: 153145e226066c402143e19c9684c3a212796d6eeda1933fdc288c852c9d08f9
font_01_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 15708 bytes
SHA-256: 21edadeb0ef708b0d09de420ee4d1a802ce108cbba096fa348ac9f370a93539c