Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a16dd0245ae6f9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-29 07:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c0b1b69aed7d1d899e0e48b5dc9eb72 SHA-1: ada365641ed8c88e779f921ef0119edf29e95b6b SHA-256: e6a16dd0245ae6f923c9e22d897265a4090141963602e2090ee3853ce6972ad5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous distinct hosts and disposable hosting, suggesting an attempt to obscure the ultimate destination of malicious links. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://polletnv.be/uploads/files/60801319469.pdf In PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/mafapiwixe.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/nesosurafarafase.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/75185365709.pdfIn PDF document text
    • http://d-innovation.com/upload/files/nikadasolel.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/sixoborijotetasiji.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/91010875267.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/ruximubexi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/48184240570.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/80537366887.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/56615163320.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/90111067457.pdfIn PDF document text
    • http://peoplefoster.com/pliki/malix.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/gugakavewametid.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/bagebes.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c298a935---pavejekeruzurus.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/37007812560.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/17833088238.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/56048137851.pdfIn PDF document text
    • https://kuepancong.com/contents/files/8834033931.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a97222881cca00a3ac8482bc9b6eab07/36011111473.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bezudofadefuwid.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/69941430752.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fumarajoguzotipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=change+preferred+network+type+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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 10888 bytes
SHA-256: 493fb266658896366fd65c586a9d7df42ee17670a869a4ccb039a2ac9db35c03
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 17776 bytes
SHA-256: e7440322ffc4161bf3b0010539dcdc197a581c0ac9272cd451b2ae8f1c7c89e0
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1