Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcb3402b4d4413b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 07:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32ad68b6ed9499726061be5a3246fd85 SHA-1: 5e78617f44751eb58369bc8cef7747c14307dc67 SHA-256: 1fcb3402b4d4413b9f16a0793b75985c1dd6fd21d587b1d23ede16cd48371f0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many of which are PDFs themselves, suggests a multi-stage attack. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further points to a link farm designed to obscure the true destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tuzoltosagmihald.hu/userfiles/file/89602755057.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb85a13a4c---basumek.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/felopozogaxononalolakawe.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/67320749514.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/31046825068.pdfIn PDF document text
    • https://vitanov.rs/files/kuvinakifaruz.pdfIn PDF document text
    • http://kotolantopeni.cz/file/72898796321.pdfIn PDF document text
    • https://lordoptika.hu/files/files/kiberen.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/24353570912.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/lidudukaxaliwatumepuf.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/86785858035.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/39572171032.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/xuwekafizozafotorinumixe.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gosuzixivonunez.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6831960013.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/gukavaviwimo.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210920080406.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/josusejasenovepekedoziz.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/78863868720.pdfIn PDF document text
    • http://berbun.com/user_img/file/758454625.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/veramebaj.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/43654108196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ludo+game+download+androidPDF 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_off0000b502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 15276 bytes
SHA-256: 37393bfcb34312482090df192fbbee086296646e75ab3c2a83f81dcaf2b1c605
font_02_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10468 bytes
SHA-256: 9a7e27ced9914deceba1aea417d66496a0dc696c9efcc0252242ab48de11ade3

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