Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66fa1a8ae5f67b5…

MALICIOUS

PDF

101.3 KB Created: 2021-09-18 17:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc31efc8d74ee078b2f2a9373bf0f438 SHA-1: 51dc993cbb81c9bc44de6d23b98d333cf381b15b SHA-256: b66fa1a8ae5f67b566693056ae436bfcd84a4185cf93bf1d19977c91b278e605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://synerhu.ru/uplcv?utm_term=android+humanoid+robot+in+india PDF link annotation
    • http://everestlodgelukla.com/userfiles/file/64666167522.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/39953232956.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/21435133530.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/rejetevisunero.pdfIn PDF document text
    • http://dentherapia.hu/files/file/logodukudejewave.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/guxiwotubuwajobawonesubu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sujedibitakanemefajaja.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/tubokafodefikofelixarap.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/vumuzeruzelokixulawu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70573882902.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/66288340237.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/55403442776.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8cac227e90f29438067c95fd442e4567/tagixugorov.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/suvezuz.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/pibobek.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/51056629101.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af90084bbf---sanopevef.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/gidugobaronoge.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/70649402474.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/ruvivupifulobinixopeviv.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/27629299228.pdfIn PDF document text
    • http://debten.net/UserFiles/File/57118945843.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/20147979609.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_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 19664 bytes
SHA-256: ecb90037f05c2124d063a40d59fcf5c1b694246a113d772c345d60b12a02c2ce
font_01_sfnt_off0001588d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588D 10388 bytes
SHA-256: 043ea08e31561ccc8f7957f2fbbd4b67c25d64a9493b44573af5b9cb257f93a3
font_02_sfnt_off00016fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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