Malicious PDF — malware analysis report

Static analysis result for SHA-256 b054c4337d8b9476…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 00:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7cc5465ad7a1e764174ff7c55fe7fdd7 SHA-1: 95e9bb069d58fc73e4bd579ec1d4d2e564db322a SHA-256: b054c4337d8b9476cb5c3b876c6dc286dac76d09e9df3c931629291d1e6b98b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=1+by+day+porn PDF link annotation
    • http://adance0112.com/upfile/editor/file/93143645297.pdfIn PDF document text
    • https://simorgh.it/uploads/file/97612641031.pdfIn PDF document text
    • http://artospace.com/pics/file/nupakimavasemanovalo.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/78631264305.pdfIn PDF document text
    • https://pecsikult.hu/files/file/72743094355.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/zaludarenitabonefanidi.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/28866609472.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/nasofitewadar.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/nusujaf.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/34845336002.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/nubexoxoluxujilepupusimot.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9ussodcrcvor6lrdvnrcc4m1k5/94651830405.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/52160204865.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/71235814836.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/vefumibe.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/4890573543.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/51808521870.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/wuwonabas.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/24871390385.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zawejitijojawuvazor.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/97747818555.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/zosadokezapagavojazo.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210928062244.pdfIn PDF document text
    • http://halaljones.com/uploads/files/wixifav.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902090514.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_off0000aed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 14552 bytes
SHA-256: 3cf03204ce3db0934b84367f40521e4bde576973e76c1a393eb34ecb065131f6
font_02_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 10056 bytes
SHA-256: 16db016a1cab4435524a0f802f6981e9bbbaf4ac5541f8eaaadd4b1c946fc414