Malicious PDF — malware analysis report

Static analysis result for SHA-256 7655aae7008832e9…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 13:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6efbfd6efea5be81853a8e366ac9f434 SHA-1: acb15152373cc160caef859df771299cdff6f9ca SHA-256: 7655aae7008832e9c7e512b00f1089bd57ceb51a8a1dca1a9ae7b35371d15011
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or phishing sites, suggesting the document's purpose is to drive traffic to these locations. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74376506834.pdf In PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menujas.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/2024926403.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/41554412677.pdfIn PDF document text
    • https://activepymes.com/pub/file/nepigu.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/najopajenifunuzu.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/badiwarirofubesekudapitut.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wotinivepeta.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/visebozeguxarozoxis.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/jixojixumaletomurobog.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da1b418ff7---sigevepirefes.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/28422401032.pdfIn PDF document text
    • https://akconta.com/uploads/files/61532173927.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/62022384341.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gejozelaru.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dkrpt6e36prf1dj3cubgebrksn/luweregatajije.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/pozajotokiluvonoderota.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/nogigijazif.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/xorojarotokararolati.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/nininuxikigasitakaxefizi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/rexumige.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/sagirawisuri.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092513493742.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/takofekumizosi.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nisodezovazojevijajomex.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/26161670270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=after+movie+series+in+orderPDF link annotation
    • 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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 15420 bytes
SHA-256: d28bad3c638fa9483ab08f690d30fdf5ef97bffa44ec14f6473e7a18e0ac230a
font_01_sfnt_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 10356 bytes
SHA-256: 4e5cdaad16742b6184d4418f861d50e819697d2241a97d3d60639496f2e4f706
font_02_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1