Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0b43094897e48a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 14:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53456aceb42ce157d6998a9440416104 SHA-1: 4fe9489d53463427b04cfc71d2998f881c7a6d41 SHA-256: ac0b43094897e48addf4652767cd5e493d4e0cffb49d1cdcf54199a3b5dae693
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a campaign to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=angel+has+fallen+watch+online+now PDF link annotation
    • https://maymac.info/userfiles/file/sirobiremagivipore.pdfIn PDF document text
    • http://yjccnc.com/upload/files/duporepew.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915151409892775.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/25697823074.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/26098418312.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/mokonikekusewogos.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/dododoraxo.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/65163072585.pdfIn PDF document text
    • http://uchid.com/uploads/file/babulumebuzira.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/55602693187.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/42798917333.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/27071253876.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/74877719363.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vp66ajrpdb8nnq7g9jtjcntds7/jawev.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/goragapidivetewadamesi.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/92197853436.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210917/files/20210917212948.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/5921052166.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7111c05e---laluguzazituva.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/61817563434.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/54864929840.pdfIn PDF document text
    • https://ijp2.com/contents/files/49830615444.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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 10584 bytes
SHA-256: 8cca892c2b94d641efcce349b58e1af73deb5cfa20f5ebc8f182bd2d446c8b44
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 17668 bytes
SHA-256: 16e245395ff1df6fdf80d33b75f9a35d542e3c17112169a7c6266decc2da97d1

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