Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc5bcf070b8fe2d…

MALICIOUS

PDF

99.1 KB Created: 2021-09-19 17:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dd8b35a668415e4d058ee20daa34781 SHA-1: 84839758faf8d51f205a17c1cb511c9ff9dbd22b SHA-256: 9dc5bcf070b8fe2d6dea7fc78e3d6486eb9c052d6f5de89ac6264c60ea17544c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. The presence of numerous external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the detected heuristics indicate an attempt to redirect users to malicious content, likely via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.cpiequipos.com/assets/images/user_files/files/38361112859.pdf In PDF document text
    • http://energy-labels.com/userfiles/file/10092043779.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/renipoz.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/53637229338.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210906_BCB641FA5BEDAE72.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/90032508827.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/38302867870.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/gajosujipavixoselitikug.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161470cd616c00---97605303107.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/499379177.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/50783360931.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/78732330923.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lakutizonipibozudapo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/tutawezij.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/23075731028.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/vekixemobumusa.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/tigidewotapezodigisusos.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xomeje.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/28564931457.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94103880676.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/banavapedazanudodun.pdfIn PDF document text
    • http://ping-property.com/user_img/files/sonibogumazanidapasapem.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/tunekuwipuvibujupox.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/susukuwopogimebezariseba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=programa+para+ver+camaras+de+seguridad+en+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_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 10880 bytes
SHA-256: 6d455bd7da124288ef1ab70f969bd34656050a6895066f109b627eb5f2ad547f
font_01_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14982 19964 bytes
SHA-256: 5b91c610dc90d1ff9f9c75299679bce8375b6d181e038ef9c25b71a44beadf7b

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