Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c61e00493d01375…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 17:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 480301ca4b6ab94b88db297c7ea3f9e4 SHA-1: a118a8fb9f969a0730f71055953baa1afc995497 SHA-256: 3c61e00493d013755985f515cb250134e2ef6be4040d97085b381ad59363bede
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=drive+to+survive+season+2+123movies PDF link annotation
    • http://uptownfallschurch.com/uploads/files/55640415257.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/nukibox.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/rosolerepupivumufakigo.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/29007642265.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/82425260058.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd56a390e---79512230000.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/verezadaperevuruteluguti.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/59045769087.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401c0bc5391---mumubuwofuladajugiwibiza.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xejamesixokarimifepap.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/tuxewepobanojojuromolup.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/57313650851.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/jadidakapovizoxujox.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/8849579627.pdfIn PDF document text
    • http://bulgariapools.com/contents/files/vitelanafazoje.pdfIn PDF document text
    • http://bulmarconsult.com/files/mukajedubogebajapexiborax.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/17600504412.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/lakazijiwudetesu.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/35051928062.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/92212111429.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pupagikupegoligef.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/lojibasefulonene.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/kosixixerofe.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/94342601888.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/91897891373.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_off0000b6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F0 17096 bytes
SHA-256: 38986e601a21e127ac47d261a6eda66d3f8b02e38155a07918a7b9689d4a7280
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 10732 bytes
SHA-256: de01151579fcd76f1443d6ea5bb7d8b2dcc67c65a5918aba45598112ae453e52