Malicious PDF — malware analysis report

Static analysis result for SHA-256 536bc31af3cf5e70…

MALICIOUS

PDF

74.9 KB Created: 2021-03-10 13:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6bfb88c71851046d43d511eb0c468a5b SHA-1: 10cdba6ecc62cd40e0f356f456060837e551c2e8 SHA-256: 536bc31af3cf5e7086fd5f40e15f0b5f1410c5e19370ce43549182ee6e4cb447
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=acceptable+forms+of+id+colorado+dmv PDF link annotation
    • http://rosutob.getenjoyment.net/bineposewejun.pdfIn PDF document text
    • http://sunugukumota.getenjoyment.net/899794622.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/aa_back_to_basics_book_free_download.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/rudedusolokilesiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fda71b257f99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_6002c2dc330b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5fe311a5d64e8.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/bfab8c551.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/dungeons_and_dragons_books_barnes_and_noble.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_5fdb3226409c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/89364578079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98780a53-792a-4c46-a05c-94ff296691ed/nekisodosavepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be191360-7435-47b3-a0f5-80c5c794800c/86924073051.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/27580248887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113408a1-7c1d-4975-abeb-e02f7052bae0/suwipolelekura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b65f693-2d4b-45f5-8b59-6eef69fd977c/how_do_i_install_hp_laserjet_1320_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcbada4-a278-4863-96d0-c10c1cc4d35d/genie_wet_dry_vacuum.pdfIn PDF document text
    • http://petefedugekuk.rf.gd/21828017156.pdfIn PDF document text
    • http://kenuzuwemonuda.epizy.com/watch_dantes_inferno_an_animated_epic_watch_movies_online_free.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/4755310756.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/ps4_controller_not_charging_flashing_blue.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 5488 bytes
SHA-256: 01491253cd53191e978eb08972cec41231696c4da95ea8213f6354de45ac5e42
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 11008 bytes
SHA-256: d918ce26f83e717e34fd30580b52217ce898a1344e210e0e65b70abadfd52008