Malicious PDF — malware analysis report

Static analysis result for SHA-256 625436c34bdfe632…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 569c84c762804974d4a6734c8ae252f1 SHA-1: f5049d48e0eba80c4f501f602f6fda39b2ec672d SHA-256: 625436c34bdfe6321657952126375bed114b310b8a2555f518d6319f65225668
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=two+snapchat+apps+android PDF link annotation
    • http://micronforgacsolo.hu/UserFiles/file/nidedisa.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/labuzumavonepetuki.pdfIn PDF document text
    • http://soupworld.de/upload/file/31873772503.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d28670c0---vewininivifuxonix.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xutaxujepovufate.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/dawuwuvivo.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/51299563212.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/81204693119.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/37290318749.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/rututimosede.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xulekuvevex.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/womoburizefufeje.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/39695341473.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/giribejupije.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/53991944671.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/lamerixi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134a229ec9e1---zudedod.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/18215454738.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mupoviwuduve.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/83799530264.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rewimibupadunivuba.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/19696722369.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/napifiku.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/54458019814.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/33729003557.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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10480 bytes
SHA-256: d82730d55b86e419c1a937369c5e641aa776ccdf89415398a3e475c454d2f0c7
font_02_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 17584 bytes
SHA-256: 67f35bf356eb377e667e0bc4f11be84a5c6a1ba391ad4197c1c06375c2d2a3ed