Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b59945e222a591…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 07:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86447a25768aa6c54e19c1300b2448bf SHA-1: 4dacd21f52a826fc3d2f596e6182ebbfd3b917b3 SHA-256: a8b59945e222a591b84d4ab76c0c0d8ddb996068ade5951dc428a659748ac498
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=icarly+2021+episode+1+free+online PDF link annotation
    • http://dezmaster.com/userfiles/file/91920082114.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-15/20210915143048846175.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4e3e2f0e315eea11d06fabcfbce02101/41161215492.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xaxuliritinevogid.pdfIn PDF document text
    • https://esz.jp/img/editor/files/18352493796.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/desumelevatam.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sotil.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/50024455748.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/palonederugidatosaboluli.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wutolekelomuguviwiveso.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/pujirisarabelisukefiwiwi.pdfIn PDF document text
    • http://dolonchem.com/upload/files/41221036647.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/65006008987.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/panalunuvunezaw.pdfIn PDF document text
    • http://trevorhannant.com/85836168221.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/91420296194.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252cc3ae81---zavuvojorosekexadakaparu.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/xitak.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/xoxununamivadud.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109040244537153.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/wasonurorepumozume.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/67720513844.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/jekilub.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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 15844 bytes
SHA-256: 14e7589a6b901eb3025b8561b1ac362e11b4ff8c9a8fa394401e7705fa4255fd
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10872 bytes
SHA-256: 5f0389691258e9d0ddf353d19431bd4063863d959b136d4095be372bba7389e9

Open this report in the interactive analyzer, or submit your own file for analysis.