Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c0f88fa6a9c1c8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 03:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c46fd07eca268ef036f1bb847ef8c35 SHA-1: 753390ad73d79d8c2078496969bb769aa8fe42f6 SHA-256: a5c0f88fa6a9c1c87d890936d825d158100b17ace44380b1186c5f2077061757
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The PDF's structure and the presence of many disposable links suggest a link farm used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=tasty+planet+back+for+seconds+mod+apk PDF link annotation
    • http://gespk.com/userfiles/file/gawenimibewelelewexe.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/mamavikepujori.pdfIn PDF document text
    • http://teifsepahan.com/files/file/98369403880.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/38778840214.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/35d12dcd41a4b882270db15594d748b4/2999542331.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa06c62a72---39203127542.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/padebovazonobujukif.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/91012450116.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/19789243994.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/vaxizol.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/komadimisutiti.pdfIn PDF document text
    • http://e-menu.hu/editor_up/94948930830.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/72376295803.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/75987277530.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/63987660978.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/89597541584.pdfIn PDF document text
    • http://ymmicro.com/files/files/danedufimolapubisejuxepob.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/wevitisojepesatirowikiwa.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/39274809450.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/30502307739.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16139053b3263b---tunamabawosubotiruz.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gibuwevogaf.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/madavazanogugad.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/kujigagoraregakabinape.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_off0000bae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE8 10996 bytes
SHA-256: dea571cb5b20b8290be0f564ce214943b567621005e47c53bfb25892777d5e37
font_01_sfnt_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 20788 bytes
SHA-256: 6d4e03fc8a551a53a251a154bb96897b2151b8534404b66db86b240dce7744c8