Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b58c748b779c0f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 11:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57ebe30f6ef2cdde50cb10e038f11a98 SHA-1: d2df54588e1e6553a7cee43625f6f11ce23e18a9 SHA-256: b1b58c748b779c0fade7308db6b735270f1d6749fb5b9ef529b8891e02d351e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://lideparts.com/userfiles/file/1630559244.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/49250126165.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/nebutel.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/budujupadovuzidonagifale.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/30988278647.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/naguvifegetilun.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/gigivutikibovowiz.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/79535872615.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/81379513479.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/12839322040.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/zuzajafamosirizon.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/95613748406.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/kotejokasigarugamagabilu.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/53983171560.pdfIn PDF document text
    • https://baglab.pl/galeria/file/20204139549.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/90646465547.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/fikivivo.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/5220071004.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a278543a8d---94231223880.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/24977483568.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/puladunuke.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/nogibudizefos.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140191bd3378---tesunadujelelozefere.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/79975695953.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/79408334569.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/puforidex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=book+text+featuresPDF 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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 10312 bytes
SHA-256: 007b3d5b2f7d19789efb287c20082df03c0642509bdbb2d026c077bb3849f6ca
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 17616 bytes
SHA-256: c8ce9fab1c69c3400126103abb40e1d058154b8a39124833acda9ee4051900ed