Malicious PDF — malware analysis report

Static analysis result for SHA-256 720518e551060574…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 12:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f0d5b7aaf91c2de1cee994666c060bc SHA-1: a3e82856a200897e42d7db6e6b11afb9dd7afbc2 SHA-256: 720518e5510605745e84b810a891adc5fc160c241d9677260df34bb87cf517d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/95504349222.pdf
    • https://brakos.it/file/72570867835.pdf
    • http://fivelscope.net/fckimages/gifinozirenamuxa.pdf
    • http://serenetour.com/image/upload/File/girewo.pdf
    • http://bk-plus.at/userfiles/files/sasifilasafimoj.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xobusidowaposoko.pdf
    • https://gentrilieu.vn/userfiles/file/bexutaxamugejimur.pdf
    • http://csc0512.com/userfiles/file/20210905015906_tmbg2j.pdf
    • http://ankurgroups.com/userfiles/file/jigima.pdf
    • http://dellalontra.it/userfiles/files/38586404293.pdf
    • http://monarchiaerembolt.hu/tmp/xaradijiza.pdf
    • http://yishiweb.com/upfiles/files/20210904_113502.pdf
    • http://frankifoto.com/uploads/pages/files/zijujir.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/81503454685.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/72624642914.pdf
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/73891967485.pdf
    • https://rireenfrance.com/images/upload/files/polilukemisajoxamegujig.pdf
    • http://ifa-astrologie.de/userfiles/file/basitinagi.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131739f1569c---32854221866.pdf
    • http://mnarch.it/userfiles/files/28054638353.pdf
    • https://gemicilojistik.com/userfiles/upload/file/38602449606.pdf
    • https://araprinter.com/ckfinder/userfiles/files/63211837655.pdf
    • https://clinicscrm.com/img/files/gikiveba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nerve+pain+back+of+arm
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d692.bin
aa54caa98bff01b4fcb7e28a1a38d16fdeade82259e23289959f07cb833a6b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10604 bytes
font_01_sfnt_off0000ee90.bin
b37aea2f35535af28be049d2e2efde311d78dfe7ef854e735d832861668724a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 16404 bytes
font_02_sfnt_off000118c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 16792 bytes

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