Malicious PDF — malware analysis report

Static analysis result for SHA-256 c984dc764ab6649e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 07:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 29c5ac38b3f8afec56adca2b39caf197 SHA-1: e707c7d18d9e98aa5b53b01bc58183ac9dea74ea SHA-256: c984dc764ab6649eadbc005dad3caa1431fe6023947f11828f900377b46abb39
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=psychology+quizlet+exam+2 PDF link annotation
    • https://cdn.sqhk.co/vefusujix/IjjhgjL/movistar_plus_gratis_2020.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/best_3d_cricket_games_for_android.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/93618382785.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/dipivixudekoziriderejinum.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/hc02ggg/nixegusibetejop.pdfIn PDF document text
    • http://ropogal.iblogger.org/43431623914.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/83nubdI/sozevejefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebojivim.myartsonline.com/16221940088.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_2e41dbf359d242ba8783156bf083ea72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d363d1fb-af34-432c-8517-0eba183534a1/can_u_order_starbucks_cups_online.pdfIn PDF document text
    • http://zewomasajeguzud.epizy.com/gitirerutewagi.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_c6ad816122fb478a952867f994394ed2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/042f8db4-492a-4fa6-9489-4d3021d7fcb2/baluxi.pdfIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_7755e9a555d3488394c795b18d27b7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df19cc40-9f85-4e9b-9e75-f2933bf4db3d/what_is_argumentative_essay_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86888d9-3d3a-487f-8741-7a8ba39a9765/the_power_of_art_picasso_summary.pdfIn PDF document text
    • http://wotupeleson.epizy.com/sbi_personal_loan_documents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3df1f7-5ce2-4e88-acbf-2536fa5894ef/92194322676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e590010-9c32-48c6-8377-ec35db1db1a7/how_to_reset_your_fios_remote.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/app_blablacar_android.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5596 bytes
SHA-256: 0555555f5c928221694c43613eedbebe96a69897dce3ca5ae7275b829a7fd25b
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 10392 bytes
SHA-256: bd105a9b28bfa5a3505f4319401f338ded56ac56687876beb7ac648e9226635b

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