Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6907f84d9a276b3…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 13:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c21c32eaa8c3b436844466aa824b2a1 SHA-1: 2be34e648b2655bc4a2ccf04b334a370bd54cc7a SHA-256: e6907f84d9a276b32521d3574b198d18618c489cc3ef259351c460e228b2f524
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=pdf+to+doc+converter+software+for+pc PDF link annotation
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/67280789541.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/sapajizurevofelu.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/94416192868.pdfIn PDF document text
    • https://linker.tw/files/75666435908.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/43528433642.pdfIn PDF document text
    • http://brukbet.com/user_images/file/73581959645.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_043124.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/luzuzogo.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/9730963756.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/10606612297.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/41983976952.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/7813649702.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/26426296080.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/badotanalosotekeguse.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/3573503451.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/xarona.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e9b25cc6319a4edf253b1ff2b583199a/xovarawokidimuzajam.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613341cbdd8e8---65590547514.pdfIn PDF document text
    • http://naviway.su/upload/files/11874146387.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/serajitavovew.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wojugeg.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/23039633767.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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 10628 bytes
SHA-256: e8ce6b3d5acf4a6ebc914d9abeaeea95d1df682efd70672cd60949326a8d28d6
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 20448 bytes
SHA-256: 93deff8f2baf60e8f28c2e4e6221474ce4ad57501b0fce473e888f33d6d9b1b7

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