Malicious PDF — malware analysis report

Static analysis result for SHA-256 97de96b1f2d03664…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 09:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e099b868347dd8dcbf0ed481424810c3 SHA-1: e268c0cf2889251d0315961c10e4da197cd74ae1 SHA-256: 97de96b1f2d03664b1e7b12a112913af6a7535baefacd306c54f26d622ac9485
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://uclerbaklava.com/resources/file/5940385629.pdf In PDF document text
    • http://monterroso-construpuntos.com/campannas/file/5798281553.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/89295593994.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/37376529523.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/35662531901.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/buribelozajupafa.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/zodigodewofilulojegaw.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/dogagafok.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/70121966565.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/72522828958.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e50107b03---gumubejebiwufilurali.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/79127182881.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/13210113214.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/xabexowol.pdfIn PDF document text
    • http://paradoxine.com/upload/files/pabulugi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc4d69e56---zagalesiw.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/64917141764.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/vawusoximutudiwipema.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/16746913497.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/39778206068.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/wurolojasanilujawotav.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fenanefukasosoto.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/32613825931.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/dazaramod.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210917_DA0A71A73D0B24E3.pdfIn PDF document text
    • http://hjhchem.com/upload/files/2823794955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adb+recovery+commandPDF 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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16996 bytes
SHA-256: 123371d5baa88b46bb95c3c7a80d01c2843a6b2bd8a2247e306b1bc91e106979
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 10428 bytes
SHA-256: 240b3cd8866a9d39af708c121ad2b89f11f10ba6f24241cfe962d239f640e886