Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d101eb19b80be0…

MALICIOUS

PDF

91.3 KB Created: 2021-09-08 23:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: f3beec299008f16c55f5afa5ef162da5 SHA-1: 4592a94c5a5d0c111a12bd94919bae2be8f72f9b SHA-256: 25d101eb19b80be0360f68903b43ecad7d114390972599a0dd5035d5c53e54f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=multirotor+sim+mod+apk PDF link annotation
    • http://hysansam.com/fckeditor/userfiles/image/nizizuwejo.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210906122323.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109070805342085.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/52464377145.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/72160496827.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/42157774009.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/5843863004.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vipadejogo.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/tugomoxavupig.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/wowatekajesonisirekape.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/nuwejowudi.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/82020333770.pdfIn PDF document text
    • https://hiroyoung.com/data/files/sijegipezejonojoribo.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/pesofojolivimisup.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/niwudajogupetuw.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/puxijidapujowaraxakaja.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lojivumolisob.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_101110.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/warelazu.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/75031256763.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/nuvebila.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902014612_1479505682.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 10500 bytes
SHA-256: 61895c064a41f5f4288cb1970cb4a3e268a029362b0196a2166df8904d7ffa71
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 16336 bytes
SHA-256: 37fa009baa434e56c9d0f8ca1702f29491c8feadf2083bd43354ef44a2d54d92
font_02_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 23528 bytes
SHA-256: 3a51ad58fb388028add68235b950744d0919fa32af6d6f9719a9ee535d984a21
font_03_sfnt_off0001474e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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