Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c0e0aa73b0747…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 19:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bab5a8d8dba9694116938d2b7abdb7e SHA-1: 21221081c589f93ef445d60c8eb21cdbc1c29fd4 SHA-256: da6c0e0aa73b0747a3d529e092a8793662d91895b0911cce5c85f11e74bb2844
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

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://adtw1.com/ckfinder/userfiles/files/82176705078.pdf In PDF document text
    • http://sun-tes.ru/files/file/24991993045.pdfIn PDF document text
    • http://one9five.com/userfiles/files/36811066043.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/vadudigupujavawifajaw.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotulikifinowiripiti.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/dogaviwosiwemov.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/18619187894.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/kolefigetabojuradevexid.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/27070373622.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/97577743235.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/22144690610.pdfIn PDF document text
    • http://diedacorporation.net/freesiafiles/file/gegima.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/timutisiv.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/88843300757.pdfIn PDF document text
    • http://travellerisland.com/files/diwipuxigixaratesofis.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970d2974bc---86827789813.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xofewezule.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/vijimonexijukanuni.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40317563667.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613336a82e74a---68280143385.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/gosovotowepejuzadu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/22182112852.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/bunodutezi.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelawavozerexom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unlock+pattern+lock+in+redmiPDF 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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 17492 bytes
SHA-256: 508b68c9061df6c808572184dfec4b663b322fb45e11f2b6f1a929faeea9b957
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 10776 bytes
SHA-256: 1916ab254c4cd5847495026bcd26eaa922b5c1c157dedb89159569bac9e10942