Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37b19aa8bec0c2b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 12:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65b7fc38b05cf6a2133bfafd41d88092 SHA-1: 74cfb90147627d49437ec33d4a9edc2d27577502 SHA-256: e37b19aa8bec0c2b8e3ad9093088b492b2e7574ef604d57ccd3318c665d9dadc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=how+do+i+turn+on+cookies+on+my+android+phone PDF link annotation
    • http://ucg-eg.com/userfiles/file/28880543083.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/28996956147.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rodixuvukabamuxo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/25452472189.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210914044519.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/50503893023.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/89836778695.pdfIn PDF document text
    • http://specimport.by/files/files/babanekamopowuto.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ruvatutij.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/fogozivedomurowureb.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/pamanigiditikedun.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/rarupi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/buzexoz.pdfIn PDF document text
    • https://chp-travel.ir/data/file/26948936741.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/tugugeripegogel.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/xawasudumadakagopupivale.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/97466957800.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/falezabotatapedagixunuwa.pdfIn PDF document text
    • https://ismart99.net/upload/files/tunifevalumonesogopis.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1d5b43eb---84101838786.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/2258110888.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t08u3t6efb37md069qkr1lh6n2/buxexugufivigilatu.pdfIn PDF document text
    • https://unaizahic.com/Files/files/33483174342.pdfIn PDF document text
    • http://119pump.net/d/files/61613277095.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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 17620 bytes
SHA-256: 5309bec788bd933a980c72adb3405d89c77ff6420de8197cea0092f5a750c258
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 11116 bytes
SHA-256: 055475b21c218b2e69591a9111bcc4ee4e4b6009ccd4dc4405eb8d7c26188721

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