Malicious PDF — malware analysis report

Static analysis result for SHA-256 812e5d732261b435…

MALICIOUS

PDF

68.3 KB Created: 2021-04-03 19:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d536c39b653e5682c71e2aeb24709b5 SHA-1: 0567e091e4b14beace90eb2273709165a7667352 SHA-256: 812e5d732261b435daf7cd64d2feafd34578bbd4e148612493483f7fe33d17e2
126 Risk Score

Malware Insights

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

This 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 specifically pointing to 'zajinet.ru/award', suggesting a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the file is part of a link farm designed to distribute traffic to various domains, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=carmina+burana+partitura+coral+completa+pdf PDF link annotation
    • http://rerixen.scienceontheweb.net/time_management_brian_tracy_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_6012ac2d1949e.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/ordinal_numbers_exercises_for_beginners.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/mivuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_601b7b8a83dd4.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/jabolomexokaporemin.pdfIn PDF document text
    • http://wavokumad.iblogger.org/new_latest_bollywood_movies_free_2019.pdfIn PDF document text
    • http://mukovasisoro.mygamesonline.org/lemifiporometozuk.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/pexodugosa/civil_engineering_project_reports.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/amenorrhea_aafp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda188e6-c8f5-4945-840a-8d84d9744ef8/new_testament_chronological_reading_plan.pdfIn PDF document text
    • http://femadonalu.epizy.com/motorola_mc55_manual_espaol.pdfIn PDF document text
    • http://roxewew.epizy.com/gulaguwegovizuzalona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae56a1b-6606-4226-b991-4f39ed09f687/how_to_change_your_name_on_your_marriage_license.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/workflow_diagram_template.pdfIn PDF document text
    • http://benugafudom.epizy.com/writing_task_2_band_9.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/47487770939.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/la_esposa_que_ora_dia_1.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/mi424wr_rev_f.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_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 5168 bytes
SHA-256: e8fd9ec55c5547c40021f3da31a5e0fc8d7733d45f136bbbf9083bfcc4f459c7
font_01_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 10136 bytes
SHA-256: 32c6b1743cf9ad58059016ae6e98338645a9f57f47dca4ea5b9f69fef929d906

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