Malicious PDF — malware analysis report

Static analysis result for SHA-256 05357d301d61766d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 21:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fccaa3cca345c174491aee4f4a46fca SHA-1: c7a507304ec06863e1cab591ae6309e1e3a42726 SHA-256: 05357d301d61766d0fd04049f13219e05b5860b37df7d0444b0629617aca9f7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=motor+tour+unlimited+money PDF link annotation
    • https://chatsystem.site/js/ckfinder/userfiles/files/93921711927.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///99897845323.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/68028585736.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/nixuviviruxixa.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/rajimuro.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/30662324345.pdfIn PDF document text
    • https://best-label.com/upload/files/poxikupuloxez.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25781799238.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/74217792360.pdfIn PDF document text
    • http://mega.kz/media/upload/files/13183088968.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/wojagalowowevajew.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/nozefepulenapofiwirudibok.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa64490c33---jinuwederavox.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zutijazeboxabi.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-12/20210912055028302419.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/vunepopax.pdfIn PDF document text
    • https://revive.fashion/upload/files/fuxigo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e498fd87---71155859497.pdfIn PDF document text
    • http://hidropro.hu/upload/gadijikolofigokixogegoj.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/sobesikikamijoxi.pdfIn PDF document text
    • http://zenkatsu.dk/files/39808634307.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/10452100240.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/48540459124.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/rasokuna.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/84055815220.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/3707324291.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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10288 bytes
SHA-256: e42c1696a52201dfef8aaa11802e2f9b7a9ddc2b8494017c79d5176eb687c58a
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 17816 bytes
SHA-256: d31e2090009dc7a8ce6ca769af9729a54615fa4365be892716ea7520e5934ea8
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1