Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4127411a5c87ba…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 01:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89fb284d4c52332257b8d4ad1e875bf8 SHA-1: 224196d62409ec2a533bbc2059b410d4bdb68fa7 SHA-256: 8e4127411a5c87ba512144154bba3615e5bf884bc6310502b44fb83695e98a9b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=covet+fashion+latest+version+mod+apk PDF link annotation
    • http://czminghe.com/upload/files/43673941120.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/nasapesi.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/mobiresiniwunifoxigejuz.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kedafasibotorigadimo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worubuj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/680kv7vqh91ukc99712ituc2q7/setapajoxorelip.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/zatikebefebazaketu.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/1782672212.pdfIn PDF document text
    • http://anindecor.pl/files/file/kozuniluvize.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/navepusukopaditafibizuw.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/vulejulatunirobajatebavo.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/88232478166.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/taxibumewimusu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/dutumobobagedi.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/26124257101.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ff9c3405c02757416e86e36711e7809/97664236172.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219165417.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xenugukuzevesugerir.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/vakenuvokebijozedo.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/82817770772.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sowaluj.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_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 10952 bytes
SHA-256: 09ac611191afc47218f18be5095d819967bbd3213f1630c489bc4b6cd51ed02b
font_02_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 17316 bytes
SHA-256: 0887b8a6af44d098223d60d15540f363e22c3bece201fb3aec2f6c7ce21fc0f4

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