Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c58648608999c0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 21:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81789220960327900b391d13114046c9 SHA-1: 4c46f2f5142c8421c1a05dfab5f93a7ebf5f375d SHA-256: d0c58648608999c069881ab143f527f4c6f7694ccbd8d71f01c95b4f4988aa2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=download+manager+full+version PDF link annotation
    • http://chanakyaaerospacedefence.com/userfiles/file/94181888944.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///14342039184.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/4439471874.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/52590420991.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/wiwulekozofavamiv.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7ec60ec9c0a2754398acdc130e1faab2/fazidumowa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bopawapabusidokuragoxoz.pdfIn PDF document text
    • https://birudongker.com/contents/files/4416407427.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/segavowazesilofotot.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3621153720.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/fujiduluxesaximoleju.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/peloxixedikumusufobixaweg.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/88236881241.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/sikilafuk.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/30882604259.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/wuninodukonuwamebifevajaj.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/nowilaribitazaxiginirem.pdfIn PDF document text
    • http://workontext.ru/media/file/gesibo.pdfIn PDF document text
    • http://becucci.it/userfiles/files/zekamadumidaxoxu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/vixexon.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/dixubutizimu.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/4708536944.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613955bf4bb8e---fatibuxi.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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 10852 bytes
SHA-256: 9ef6e879100e5c30ca93181674f7d4444fe2db5d9c567a5bebac5348314fb68d
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 16712 bytes
SHA-256: ca8a4523a4c1abe19ecbd86cdf9b03f0275d103d4c8fa01f5124807d1b827cf5
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1