Malicious PDF — malware analysis report

Static analysis result for SHA-256 213d9eb26fe3b9a8…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 21:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d10d55ceb642ec19ff5f25d44ecd431c SHA-1: 94bf104bf3314b413980a8a0381ee54edf677e07 SHA-256: 213d9eb26fe3b9a8f95b839a2e9d8966860d212bc678c95951778ae480fafcb4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru', suggesting it acts as a link farm to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy to obscure the true destination. No scripts were extracted from this sample.

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://ponafet.ru/aws?utm_term=cat+in+the+hat+cartoon+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff98fd7645df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5fd9191b851e0.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/ijukgkk/blockchain_voting_system_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/gofejenizew/fiiheph/asrock_h310m-_hdv_m._2_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/dhbThfC/mumurubabikifefujo.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/hgjiihi/58918866919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_603b81181235b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fd1778aecfc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favagapararo.epizy.com/bulgaria_visa_form_online.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_4f638e96090947239a626d2ed5d1ffa2.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_a0c2182a42914386ae6a21cb9e6746ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/acid_fast_bacilli_stain.pdfIn PDF document text
    • http://zuvojiveko.rf.gd/pizepavo.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_f3c52797ad084f0aba0d353a536a69d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/date_sheet_mdu_5th_sem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b0e6f4-5cff-4214-aa49-7c32b9763793/titulos_de_credito_tipos_y_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85d7492-151d-488b-b1d7-4b09bcf9ef7f/20521795303.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/which_of_the_following_is_meant_by_the_phrase_nuclear_deterrence.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/alternator_protection_relays.pdfIn PDF document text
    • http://kitukogoxav.epizy.com/43480035711.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/yamaha_rx-v375_manual.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_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 4932 bytes
SHA-256: bf5dd8eb02b24140be9f7be194cc732410c16a76fe3c34a74db44478ced2548c
font_01_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 11048 bytes
SHA-256: 69047c9e82a9ba2bb8959e39b89f4d4e74c8733813b3a74fc03c8a56f093b020

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