Malicious PDF — malware analysis report

Static analysis result for SHA-256 199cb720e10ca25c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 12:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6423b8b834ddcee79abefd75a0a2d567 SHA-1: ad9802db5b2fc181ca49d722f634d9ec1f8470da SHA-256: 199cb720e10ca25cfd303398cd33cb9312b229ccf0b32bbb425ef651cd4e730a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://pristineleather.com/userfiles/file/86764177609.pdf In PDF document text
    • https://ms01bet.com/contents/files/59978054123.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/20334535765.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/38754253535.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/23069406994.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/remusorizofekizuxomo.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/38987556559.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_4BD656C069F827FB.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lofazaganewiv.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/27035723551.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/luxifixoduxitodejuxaja.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/53891086648.pdfIn PDF document text
    • http://hanifeugur.com/image/files/67019879099.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qvt25r0atdo998cap812nkkdud/2703896375.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/28339407662.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/bigigodolekif.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/87331588760.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/likixuruxosoxesulexa.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/bivezutebano.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/mozifal.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/48475322703.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/masogepatisizukenexigape.pdfIn PDF document text
    • http://kammed.com/userfiles/file/68994979474.pdfIn PDF document text
    • http://yuhongzg.com/d/files/29877565189.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/84269392257.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e20640bf0a6c1bde6614469e01fec7fc/furubowivugefefolewaxegag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=prisma+3d+pro+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_off0000c440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC440 10436 bytes
SHA-256: ff7ae609a6836ed6bc948f32a0a90f348d30b8a3624e1546b02bd36341973b6c
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16648 bytes
SHA-256: b2e44952b2eece55c0a7aef9a32e4753f7d7ce87c0cb231c9daa3db5a308a545
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1