Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca0eecc5e20de4c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-11 23:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9358b9d9061f0ed1e02502e82cefec9e SHA-1: f79952a3c0d1c13a5827cad8a0fceda843f3dd4a SHA-256: 5ca0eecc5e20de4c185a757a20e4cf9aa3ae5b626878b8487818d2a5a9951913
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://anitt.in/ckfinder/userfiles/files/65797513536.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xobozopexuw.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/rolonodalugolejurujigubew.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/faxolukikifele.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210906174656.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/3390853875.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/67429142582.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325493174bc---kikesuxesuk.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/71662339883.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/59915878538.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/kiwadujutetefuke.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/lilibifulukefeguf.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/15907005093.pdfIn PDF document text
    • http://www.heksan.com.pl/file/49049989195.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/12972521394.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61345085597.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/rebivafosomuvuziduwel.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902063345_anVib3Nhem9waQ==.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mewupaxabibapevigebejabub.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/71983481531.pdfIn PDF document text
    • http://geraldinekilkelly.ie/najilefonipejabe.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/jomire.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/58373600820.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/lolusuvobarinenonoseram.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138dacb232b9---mazilurimumexun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=excel+study+guide+pdfPDF link annotation
    • 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_off0000bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDF 10608 bytes
SHA-256: ccbc1373999c3f28d898313a1bbc65e18ecbc84083aae178b3bedce73f27f3da
font_01_sfnt_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16264 bytes
SHA-256: b3992aa78a54ea0c0bb8e0743a07d51338dc542712e8f2158fd2a77a316fee54
font_02_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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