Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae71e413681b3e3…

MALICIOUS

PDF

76.0 KB Created: 2021-04-04 05:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a7552e9e20488ca2e5cee3824b16c144 SHA-1: f96c0590e03d20d1b091a7d3325905296a6f1a0a SHA-256: 9ae71e413681b3e34f451086cf38c6db7f6eb1e5fdbdeba1622b9b9a35d90fe3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a prominent one pointing to 'zajinet.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious links. Although no scripts were explicitly extracted, the nature of the embedded URLs and the detection results strongly suggest an attempt to redirect the user to a harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=subgame+perfect+nash+equilibrium+mixed+strategy PDF link annotation
    • http://gazupoz.sportsontheweb.net/90227523593.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/iegcibE/airplane_mode_cast_jenna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_601b5f01856ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_60564f7cb8ad6.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/the_master_swing_trader_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lixijadimit/jjxK2oT/11749292371.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/fmgeMFJ/fill_up_3d_game.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/57805146922.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/tirirafusejavesubokowutep.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/ePijib6/23177409477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a712beb-d21e-4bf1-a768-51abd7695cee/que_ao_de_vehiculos_se_pueden_legalizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d067e40-0591-487b-8b20-cbd037bf2eda/30491483755.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/lutev.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/numegedu.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/how_to_adjust_a_choke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a12079-ff7d-4d70-a292-470172425112/kidupukakejak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd2e666-8236-4214-9c1e-5f052ad82555/jinatolej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90448ede-e49c-45cc-9c2a-3961652d6d2d/ugly_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef49efc4-7ec6-4e8b-a564-c75af390a35f/33525589468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5a2344-23d0-460e-bba8-e8bbcbd8dce3/royal_barbados_police_force_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ed287a-a659-4a10-994c-b6061fd9a579/lapufagupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ce97df-1788-48ae-b713-813a869520b5/does_old_navy_have_maternity_section_in_store.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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 6108 bytes
SHA-256: 5b677d519bfd12db823a8302d62f709c9d943abb3a498bb1a6076e464ec70443
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 11804 bytes
SHA-256: 30992d97743fd43735cc183469278c95d517dcfb930202929f37a3c292592b11

Open this report in the interactive analyzer, or submit your own file for analysis.