Malicious PDF — malware analysis report

Static analysis result for SHA-256 0882c9328092458e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 23:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be2e8b65b5e4543fd47e1a3d1d604203 SHA-1: 76f89b70c40965b891faede3b596e5896263b25b SHA-256: 0882c9328092458e563d33dff252e97ff6da516d9dae46c867e327e065de7806
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 and also by an ML classifier. It contains embedded JavaScript and multiple external URIs, indicating a phishing or malware distribution attempt. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://medvor.ru/uplcv?utm_term=treasure+island+sunrise+12+pdf PDF link annotation
    • http://sdsenlex.com/upload/files/95318365563.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/zunudapovilafugodiwodapil.pdfIn PDF document text
    • http://silver1979.com/upload/file/82447942473.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nadoroxo.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/gomopenad.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/zepifepikevetanojabet.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/tadoxik.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/vizerulexoloriluwa.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/suxusapedep.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/3093167449.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/wolopegesukutukobuvaxofod.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ge266l4b64mqn7al5g40a0qhmk/37382400780.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/21973274209.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/kovufilidod.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/jijolasatorad.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/77936157901.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/11596123889.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/sogutawoxijakozelewixub.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/62924878466.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/23649919859.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/kabudokavakuxiku.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/78036744126.pdfIn PDF document text
    • http://newcityhk.com/userfiles/427466721.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/guvofowokebi.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/49284554829.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/wakodutenixarovaro.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufosugoxuvuna.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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 10508 bytes
SHA-256: 9172f0ce613c8b941d242338edb02348185cba283afc85387bb7c0a1715aeb09
font_02_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16688 bytes
SHA-256: 4d19dd219c8384901651582fc0aee6b88d21ba4bc91e11b2cc55761d9499de46