Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5ce67a856b7288…

MALICIOUS

PDF

119.5 KB Created: 2021-09-18 08:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 653ee3152f8a243994558c56b4339773 SHA-1: a15ffb65aec216524b4c0e05372edf7539a3d41d SHA-256: 1d5ce67a856b7288f5cc0df2a8ea9365cd60f70cc583e6fb6b28c0368b5bd8e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, hosting numerous links to potentially malicious PDFs on disposable domains. The embedded JavaScript likely facilitates the redirection to these external sites, contributing to the overall phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mebel-moscow.com/content/xuploadimages/file/moxiteziwuguj.pdf In PDF document text
    • http://rfinshaat.az/userfiles/file/24407841740.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/25515167759.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/11251730393.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/66663089612.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b36dece---piwanos.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed78621e2a---jivotirafixuwene.pdfIn PDF document text
    • https://ptogel1.com/contents/files/57162649604.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/lidazabifoguvugugofusa.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/8553504704.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/81111573429.pdfIn PDF document text
    • http://mebco.ru/images/file/rasokitav.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/durowexakoj.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/kadutevu.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/wubosuxaterigidovomojefax.pdfIn PDF document text
    • https://projetovm.com/uploads/files/pobalikarikonifo.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/pubegevoxub.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jupuvudega.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/3243816389.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/79931309702.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/86359385804.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/37703155918.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/88408046502.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/wozufesagepefokabexepuzig.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/79379511502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=should+i+have+an+antivirus+on+my+android+phonePDF 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_off00016b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5C 11012 bytes
SHA-256: fddb20048498c279142557b23ca29cc4e0f25e42704eb16f831545f6dbb36cb2
font_01_sfnt_off000184ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184CA 19592 bytes
SHA-256: fd10e13d1ada480dfa7636b8b7ae2235f22f8adbfb1bd666fcd3249eb12e753d
font_02_sfnt_off0001b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1