Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe212e9693b5fd28…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 00:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06044248f501d01c301653f50402815f SHA-1: e5f56ec996653321e11c9638dac1b62c161c5839 SHA-256: fe212e9693b5fd2873a474e7945e86d01084d0a127b6dbb394e7e49f3e265b33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of a link farm with numerous distinct hosts, including http://nasfthr.com/userfiles/file/ketunopewinaga.pdf, suggests an attempt to obscure the final destination and potentially phish users or deliver further malware. The URL from feedproxy.google.com appears to be a redirector for a search term related to 'gta v mobile'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nasfthr.com/userfiles/file/ketunopewinaga.pdf In PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/lefujidubujeweg.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/fadijizomitavenogijikenu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/wukemop.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/lanix.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bd9143187---piduxotanivoto.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/zizununewap.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/83430292209.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/4814877357.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/67695224725.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/waxenubesule.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32145397105.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/38157823008.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f056f161ae---53712860461.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/14538996976.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/28019011030.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/36410203912.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/47756281820.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/21323748321.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/dowuxonuwogetamuli.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/vexufaxebifutaguwirid.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/pifekekezavomowigutogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+mobile+without+human+verificationPDF 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_off0000adca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 10864 bytes
SHA-256: d6eb9034df7a9b9fbb65d9394f68d64d854b30b2cf945c4fced1846b31845ca4
font_01_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16088 bytes
SHA-256: 4e2945d180dd9e6ff32beab2e9c6cba85f78f658bc6079e44d30699829abbf88
font_02_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1