Malicious PDF — malware analysis report

Static analysis result for SHA-256 e201c4ad7113a20e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 05:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 877d0b81340761170bc1cddf9ec50b19 SHA-1: cde6f98883241928d6411402ab83dca7efd5a70c SHA-256: e201c4ad7113a20e2533bf4ebe3ffcbc08e96e6e6dcbb44f18057af84157f684
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm designed for SEO manipulation or to serve as a distribution point for further malware. The document body is heavily obfuscated and contains no readable text, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://makiriaszto.hu/ckfinder/userfiles/files/10448121486.pdf In PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/4232132571.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/fujus.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/74939364821.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/poxemetafimo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pezonotesewodikiro.pdfIn PDF document text
    • http://htwy.com/upload/file/zidatowowodazujiligadu.pdfIn PDF document text
    • http://parateam.cz/file/86609764853.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/84195814264.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/940d5552d4d1a912e6003a86188ca385/lebagurivif.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/meloxinemutonozuruvatez.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/14643826419.pdfIn PDF document text
    • http://www.pvvc.cz/files/lifebenewoxatexedageg.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/80337314716.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/xufekigogunoramoberojam.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/80400692581.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kajujur.pdfIn PDF document text
    • http://sakem.org/userfiles/files/toliwowapozijejitip.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313da3f0f52---41390225581.pdfIn PDF document text
    • http://dolonchem.com/upload/files/konabudoponi.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/wiburi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+print+app+for+androidPDF 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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 17372 bytes
SHA-256: 326501e9c376a3c99d1a0a85c19e159b649a0263008e9c086560424482e6dd5a
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 10500 bytes
SHA-256: cc349e8dc03754d2609f3b58eb72f8d9a898f706b614d168f9536fe33367786b
font_02_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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