Malicious PDF — malware analysis report

Static analysis result for SHA-256 e319cd1db74ceeeb…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 01:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2063b3df202c4b0d8214dca282164e0 SHA-1: 108161f97986c1af0e69e75582e3739afee86107 SHA-256: e319cd1db74ceeeb5fcfea49043e88897f38f4f147faf9253071e999f2154cd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=borderlands+2+zero+skill+tree+build
    • https://behbehaniprojects.com/uploads/files/subolubivo.pdf
    • https://audreyheselmans.com/_files/file/45811219052.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/97474646671.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bpq5hl1488bpgq1sel0lgngff4/juwatuzokewonoxagorajufi.pdf
    • https://dukra.sk/editor_uploads/files/67467448098.pdf
    • http://dlastudenta.org/Upload/file/25799592326.pdf
    • http://sake2metustin.com/uploads/files/79855627344.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/wuwarutegomolugevebimasu.pdf
    • http://techbico.vn/uploads/image/files/keripitizinunefiba.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/09cc8871ac288d101fbf90e441ffff1b/56120748856.pdf
    • http://goldenpeak.it/userfiles/files/wibibaxa.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/26990267824.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/zopubadowebofimaje.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/misanekipoxugugapizi.pdf
    • http://ip-malkov.ru/uploads/files/56748943992.pdf
    • http://nissanotogovap.com/uploads/images/files/49066867913.pdf
    • http://annassteen.com/ckfinder/userfiles/files/vozefuxifuxivaxerupikewob.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/34779319792.pdf
    • https://stallion-international.com/userfiles/file/6780498311.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/9794961908.pdf
    • http://ecovn.vn/uploads/news_file/rizefasawiwede.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/mawojeravuxev.pdf
    • https://advantage.ee/media/contents/file/53260352740.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/pofekilusepugosapi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee22.bin
88925177773b3bd362b417a5cdf1fe9266e5a7464e5d2a1a0afb564504b79e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 17656 bytes
font_01_sfnt_off00011b9b.bin
670d1c2f920c3595a552acb4366a1cefeb36415cc3b2cecdc8ca2bfbde647315
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 10808 bytes
font_02_sfnt_off000134bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 16792 bytes