Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef19fd3c4829ad7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 03:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 002d159fb0ff5e438b448337ae542f87 SHA-1: 1f4f4a905db386e0ff720cf8e55c54e133ad6cd0 SHA-256: 1ef19fd3c4829ad7ec717c91b204febc2eb2370aa44cf448b09088d5b7639091
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. ClamAV and an ML classifier identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://beautifulhairstore.com/upload/files/9276023077.pdf In PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/guruloloburigirojevuje.pdfIn PDF document text
    • https://riwg.in/userfiles/file/kuzezezo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16142e361b2717---mojoja.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/vuweguwebapaxoge.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38240577470.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/02278213613fa2ced29acd8e1a9f3fe2/gewupuvexalorivemumewa.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/domoxepifiden.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/nalixuwezexen.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/7987816021.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/feparedigupesiv.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/22885136264.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/zozuvugolutejoji.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109090930053242.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vesujakij.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b82c7bf42---32207981806.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/xitivusewirowovujediz.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/29346890257.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/38894460333.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/52650979769.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/koxadubutare.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/xarebuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+browser+clear+cachePDF 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_off0000bc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0D 10576 bytes
SHA-256: e53ec4f63a19d4526ee8e0e217ae74a51bdd4b552a46214691f614f21fe9518c
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 16464 bytes
SHA-256: 70f659f1a262989c465431e011389d70e91c12c1914a5b26e7cdc14a1fd4fd71
font_02_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1