Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e3cc21f206ec73…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 16:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50cad41d8794e6c86b2e6b0632b52bf5 SHA-1: 070bccd8647c613da417c6e366b7e892e16067ce SHA-256: c8e3cc21f206ec730579d9d200930c64205d61439dfa0a14633f26a96b4f49f6
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content are consistent with exploiting vulnerabilities or tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://talesma.com/E/file/45191275527.pdf In PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/82705433338.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/58357914330.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/letejiwanomanevajuro.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/99418939260.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96311701228.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1fdcc38716c30376d41545557cbbbc5b/60948894432.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/99861528884.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/85092110148.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/26085654175.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/nevifasezemab.pdfIn PDF document text
    • http://w-mill.jp/images/file/45547793382.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/54058081725.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/zodezifubixefisinev.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161448bdf45201---15811192585.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee894e1174---lenikejerekoti.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/63203225440.pdfIn PDF document text
    • http://sushi-belovo.ru/files/79971919934.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tulip.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/29386840894.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/mogaxilijofuze.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/67454645799.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/45017348658.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nadukav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=top+5+games+under+500mbPDF 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_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10956 bytes
SHA-256: 1be413ab5f84635ec0e81447594d1ff0c20619e80b5ce4c891b9467614787fb5
font_02_sfnt_off000115dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DD 17672 bytes
SHA-256: e2e4dece875ec384e4564ec77af5dc6d00ef4b509931a5d05a908adb2e738047

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