Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb308a565bab15dc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 16:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1677d62e834f640849d1164f99b3656a SHA-1: 24e0511e9b0b8a12e7719ed21cfad6180b5ea9a1 SHA-256: bb308a565bab15dc979852a5361a4b931bc354adfc8d0724e41983c8d6ffc3b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://gyn-koe70.de/obrazky/file/xovok.pdf In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/45283024443.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/31330395670.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141230d03741---6108394879.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090115490073499.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/25678485177.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/zoxukel.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/tuvubulegubarumawepiwig.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/zurudedamupezen.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091915495829.pdfIn PDF document text
    • http://orderkai.com/uploads/files/zewatuz.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xuzegases.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93502831391.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/zazejuserobuba.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210906_65E2D46E8ED98F10.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/19206807604.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xusexobeludimisewika.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902232427.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/97198245038.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/tumirilenepevubam.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/nepon.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xunigekikugizufutites.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613d575f64d07.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/18818752855.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/60884859228.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/relolarasavomavod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=boruto+episode+201+freePDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10628 bytes
SHA-256: 942b032cb5b02cf7eea5d9317e9b72e6ec601165fefe9f791e10d8106a5f1d40
font_02_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 18296 bytes
SHA-256: 5870b40b2b9cd0729b6b6bbba64cf1b2f7bb973ac8ef9de9598804e797a2b788