Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c20c1d952ec09c1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 19:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a19c3f6072790cdb9a014e4fd014b88b SHA-1: ae1211cc17209feab4cb4ed0f351ffa80c9c8cea SHA-256: 1c20c1d952ec09c1271e5cec7375d03cb9f50998bb0c20b4175210744c2c83bc
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 domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to host phishing content or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rococosofa.com/files/files/42183167069.pdf In PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/dokewutejosaxevefajirokor.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021090820272435363.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/46543237905.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/40796682434.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/edfd85928d85860fde354f89f44704c3/21019725995.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/tukapotajolulufumun.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/nobededazaba.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jivisopegidosifimegasasu.pdfIn PDF document text
    • https://onlinendttraining.net/files/89962681966.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/votifak.pdfIn PDF document text
    • http://sentai.cc/data/file/20210909_001002_713.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/rugotutin.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jobidu.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xexovawijus.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/pikemiminafadaba.pdfIn PDF document text
    • https://adikketiga.com/contents/files/butival.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8b749293---gofabepomafeguz.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/4399500483.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fowugibefagegoro.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/birulidalux.pdfIn PDF document text
    • https://olterus.info/contents/files/99449274007.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/robolegegipowolofakuzaf.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/38098812211.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/60059610530.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/45078595821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ringtones+de+animales+para+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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 20168 bytes
SHA-256: 5cdd0c8452c745fed621c0053695a0d4becd4869c52dd1931bdf519687896a57
font_01_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 10780 bytes
SHA-256: 3376f3d5edc4534619429341f3a73844b0d5e47e398de78efefe48145db2e03b