Malicious PDF — malware analysis report

Static analysis result for SHA-256 6321bd6883194212…

MALICIOUS

PDF

79.1 KB Created: 2021-05-18 14:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9628f6eea40d945e5499dc063d9894ca SHA-1: 610498a6ffd1c4da89b0b80fa88b25004c8f4e98 SHA-256: 6321bd68831942129c5ed3a3accdc993001bd8c030806f7a76737b8858fef2ca
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' and containing 'utm_term=the+sims+4+mobile+hile+apk', suggesting a lure for game-related downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is designed to host multiple links, likely for phishing or malware distribution.

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=the+sims+4+mobile+hile+apk PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3197138-7a8d-4acb-93ea-289435afc9cb/fisepojinamitul.pdfIn PDF document text
    • http://ridupokibi.epizy.com/gogererusugeraxaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72b78cc-b638-4d5d-a335-9db45956cd89/effective_writing_a_handbook_for_accountants_11th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760f1569-7e0b-41ad-829d-4ef811a53b96/65116144444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe6c91f-8a6e-4113-b21a-31124693783e/xoroduxeb.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/lagu_surat_an_naba_ayat_1-_40.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ac1a4e-cb91-44d5-b78d-cfbe5edae4de/wuled.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/vulanewititezexewot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fa3b67-4a37-470d-bdad-6c534f9d4b70/matadogololilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484a8169-e36f-471a-8ad5-d781b8fdbc34/kakubilodexali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bbfe08-71d4-42f3-9daf-6283d87a8571/is_altered_carbon_still_on_netflix.pdfIn PDF document text
    • http://bojefej.epizy.com/profit_and_loss_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/configurer_adresse_mail_bbox_sur_android.pdfIn PDF document text
    • http://zemabikavowon.rf.gd/91257306565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af441380-75cb-4bb4-9c37-a102b3ed4c88/what_drugs_are_illegal_in_singapore.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/set_adapter_fragment_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c62f7a8-9165-46f3-a20a-358a225aa592/hp_laserjet_pro_400_color_m451dw_manual.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/43453664345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27c7509-102d-4746-ac8b-49632d45835a/how_to_mount_a_television_on_the_wall.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/archero_unlimited_gems_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654ea314-037c-41d0-ace1-a1206ca94c54/overlord_2018_download_reddit.pdfIn PDF document text
    • http://sigebetomisokuj.epizy.com/92309061724.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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5204 bytes
SHA-256: b0fe16bfa3c6707291621e0e302f87cf47ba67f0ab9decabdedf57cf8b930555
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 22752 bytes
SHA-256: 986b826b3880f4773f52202beb1b897248cdd85690f78ea52f170a78ced03d58