Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f13ec11477638d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 06:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49b49d3f9378b7a564ff8cc256c694ea SHA-1: bf6efa57335b6960ac16fdb02f047c7fc051ba7a SHA-256: 96f13ec11477638d53379aad55fec54e46996d064d5a7311c305c95473cad629
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://wastran.ru/uplcv?utm_term=top+10+offline+games+for+android+2021 PDF link annotation
    • https://joinvita.com/neu/userfiles/file/31686731992.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/95401392560.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/dariwipaturo.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e27386da5a5d0496a31c93c2a2c6ff54/67214494389.pdfIn PDF document text
    • https://eternalbliss.net/file/gozigafonevutevuve.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/vezozifilasubemoloxodadax.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/guvufitobevegivokemi.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/51667873696.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/danelukuki.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/popuzenoki.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/12336606431.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17794642471.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/likabusemisatomeferelip.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/33160654007.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zifudevavakukutuven.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40846228008.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613477c2bdc0f---58217031078.pdfIn PDF document text
    • https://soechi.id/userfiles/file/43864213789.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/59491823023.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/72080812747.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/95135917681.pdfIn PDF document text
    • http://koddous.com/userfiles/file/37441121735.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/59275945120.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/suxabukafura.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210903022937.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/biligajefafosala.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/sojanowofakafobofusuju.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_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 11000 bytes
SHA-256: d54ea2c18ca6aecc920806b95c53dcd5d2e84067a4befa3c3244456c1e753d7e
font_02_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 15820 bytes
SHA-256: d6421b3fb4bfd4f751804a6841781892e1f976eb3461c67dbf4ce62d754c9a01