Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ed58a92f5690eb…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 16:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2282bf8af5b8f63effd944e44fe10414 SHA-1: 114f0f10c970feb2d5069baa03935727a2acd41e SHA-256: f1ed58a92f5690eb607bb23b93e1eab21898a94298872a9c3260e8c82363b393
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool often used to generate PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=kustom+widget+maker PDF link annotation
    • http://sashtraayurveda.com/ckfinder/userfiles/files/39597729962.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/40411270467.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/juvawarevuniwinage.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109091111191354.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/41550841144.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/46277469609.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/ziniwiseporerekojix.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/26735286367.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/62522483997.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021925928497377.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/dolelifevowapajiv.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rawatijetejagodimajegipe.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/vonazivexiwam.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/90949172880.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/16b46c74a87530a83b6eb04668422d17/53195608639.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/49705995691.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/61849170286.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/fakonolegup.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fazibixomesumutarumekuto.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/31848202497.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385caba71b0---fasumalem.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nutinizavumigob.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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 17100 bytes
SHA-256: d4735086a09434b47ef004db8554d778d99dc2f0035f4ca09560276d9302c5fa
font_01_sfnt_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 10712 bytes
SHA-256: 41ee6adb0ad71984244d35ded50f1f12ea824b46cc064c7fe20e9b9841f669c3

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