Malicious PDF — malware analysis report

Static analysis result for SHA-256 3628d0e2f475ee5a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 05:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc04d545afa04cefcfe261ff530635e2 SHA-1: cccefea3e3696c2aede374d3993c735e388660bf SHA-256: 3628d0e2f475ee5ae86bc5abfda5037a678d2aa37a6c655e656187f0128a9bc9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, with a high heuristic score for being a malicious link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. 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 0.9974

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edd927e6e---vilub.pdf In PDF document text
    • http://taiwangallant.com/uploads/files/202109062043395383.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/ditotaj.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/34277755991.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417007c5b38---nidireresugenoxigaripur.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/96250404004.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/21332136758.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/75101074952.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/43425867444.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/76380779651.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96584442194.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27193465346.pdfIn PDF document text
    • http://metall-press.ru/files/6105707622.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/suduzi.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902201657.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/23950055690.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/15603532048.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/36532198181.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/puxarumugozosesusuvezu.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/23451319193.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/wanokukitapomiwudif.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69011759424.pdfIn PDF document text
    • http://www.bash.cl/media/file/7262459958.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/refotikob.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/busovovimibonos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+logout+whatsapp+on+androidPDF 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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 18132 bytes
SHA-256: f520938cd54c843afab20f0af7896ccf6723b556e121010c4f1c15456174d40d
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 10716 bytes
SHA-256: e7e58199890cb9ef78e66bb465897c53f88b766908ed3a2f76ac8f8b870eeaba