Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e0cf788b45a33d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 00:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3368e178efd0ac1b1d49235ddc34fad8 SHA-1: a8a96e4b8ada04fb3d250b4bc24820b8165550a6 SHA-256: a2e0cf788b45a33db5bce90da8ca2908db7bdc18a69ffe75e30a47eed08884ed
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=the+promised+neverland+torrent PDF link annotation
    • http://marquisdecor.com/userfiles/file/54482963658.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/99373222727.pdfIn PDF document text
    • https://olterus.com/contents/files/vuletusivodulipevese.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210903/16306374446997.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/vijewumifanosinib.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/tazagifibixonade.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/zaxupifimemodujijagavim.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/rapap.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/raxabaditeve.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/sozudije.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ioo8mbusg0okgejott7fhfqn3e/3188506975.pdfIn PDF document text
    • https://servicepapik.ro/files/nuwogef.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/guwetivaw.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/84802969771.pdfIn PDF document text
    • https://codecs.ro/images/file/55453780771.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97658494595.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/ruzobuwab.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/38842925036.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/repudiwa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161302dda28f74---zodej.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/93518779855.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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 18780 bytes
SHA-256: cd07194997282987937c92049ac8975e7b05db0bf07d45b514d0902f2a04b646
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10684 bytes
SHA-256: 05752bd18b62ae5045e45181570db2a1ee5bbc9b0f09fc7f46202c0ef3e58053
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1