Malicious PDF — malware analysis report

Static analysis result for SHA-256 35139ab4579bd83e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 02:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea6b54895321508d76c797fbe3e4922c SHA-1: 9e8ad0cf4a35c7bbbf73abb2add691d19919edb0 SHA-256: 35139ab4579bd83e7b9f8dc0cbda898bc0c2e8296208437f94a49785cad91663
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ristorantebiscione.com/userfiles/files/rinikupomapiwumufatuj.pdf In PDF document text
    • http://eltdb.com/UserFiles/files/zigimow.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fajozidowaruzuwewuriz.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/wukomupisija.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/rixebazizivubu.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/23053753751.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/38293899334.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/2385629021.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/39426596519.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/lifunavesi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc86e84e9---50126915253.pdfIn PDF document text
    • https://tl-systems.hu/files/files/32591983962.pdfIn PDF document text
    • http://didopack.com/files/nuvutilib.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/39757524634.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/bixizelutugareluzepizugu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebe7a3554e---zujewupexudexufujefuv.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210904_100941.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/28949297781.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/72032802848.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/besuvabe.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/ralizebitanoxabupaku.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/71192515562.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/kusedolumazomivezopem.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/kenojipawapovowebejati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=convert+source+code+to+apk+onlinePDF 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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 17368 bytes
SHA-256: c1f4f0cd8b55738bd7ec146c75658d6ecdad4eec99e11ac9171c61a63cc845d9
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10796 bytes
SHA-256: b3a9e7e703496a25abebaafbfd3d3a75fbecd60e88dc90da837efbdbef047378