Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f119d23e7caad9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 11:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9126c6fb38d4dde8c3c2290b4b7c7ce3 SHA-1: fe37e8112c1d5df73ea0bef39bb0075958b4ecd4 SHA-256: 74f119d23e7caad91736fdffb96fd2619bcd70f4ab7afafebc2539ee5ad4a547
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for the detected external URI redirection, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=genshin+impact+new+codes+2021 PDF link annotation
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/jeloxavozoso.pdfIn PDF document text
    • http://bwc.lt/i/30974138172.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/fevuvadetefigotojokefomav.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/mimovefowasifexopimafer.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/44619381481.pdfIn PDF document text
    • http://mayphotocopydogia.com/upload/files/81362453325.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/riwisofen.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/basuf.pdfIn PDF document text
    • http://teakdeck.pl/files/file/keseruborovejigumana.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/62208865996.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/mosinevuwomibuwureluzidu.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lisawonise.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kabomu.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/57460507792.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/vuzepedugubarog.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/90700971791.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/89501108178.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/60124858071.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/643819112.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/17064911020.pdfIn PDF document text
    • https://jotelek.hu/files/file/37715108956.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c4f5d81f2077f809c2fe84afd7d54f23/tivunilolunedu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/74431651726.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/42732830084.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/beloduk.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_off0000b366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 15056 bytes
SHA-256: 3abb13832c3805b09fd7b7a961875fe29e3cf9239afe1eb845c22904ce66d9e6
font_02_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 11052 bytes
SHA-256: 74cc7d4095651b1df10b5019d1f0d6ad4384c68ae67061f7e4a1b63962f55a96

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