Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d3f1603dc12f9b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 10:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb30108e5dea68803d9213ca51b76e37 SHA-1: 431ee382bab0700f9b00aea01b8b91df617e2e38 SHA-256: c5d3f1603dc12f9b9af13676b0f25ae899853a13dbb1ce021296229cdc628464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=quotes+love+my+job PDF link annotation
    • http://cesvil.it/filesUploads/file/tekolorokatokogut.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/73800219297.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/peviv.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/87459751568.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4706707528.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/7310702846.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-15/20210915221627944286.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161379eb4d831b---61035623572.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/16222397823.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/38881858199.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1d89b332402b95ad1e591d04c953e2c4/bidebojogisepefogepowagib.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210912113512.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/fixokib.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/kapidazipagitederuze.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/musesaguligebudi.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/97408350077.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/pajejimipigixowebif.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/21211977184.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/goxobamuxitevoraxegon.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/nerijizisumotej.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/91668088394.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/45490059142.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jabunirovu.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_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 10420 bytes
SHA-256: 7ab5c5a06f0fcf056ae02bab884be337d269bc1fc40119cda64712a68f07dbb1
font_01_sfnt_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 18116 bytes
SHA-256: 2c8da665890c3475e86d2cb1760ff29799d0b9f4d7463c7aa9ed83e4a157789a

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