Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f043b388f08612…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 08:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 826c586835a34df507cef32a2adc3c04 SHA-1: 7211b8e50675177a1d23888cd6656190c067b90f SHA-256: f6f043b388f08612951840a088a21c7b593fc5ca6d3a69f838e3340c6463660e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/award?keyword=the+artist+s+way+week+1+pdf'. This URL is likely used to redirect the user to a malicious site for phishing or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/award?keyword=the+artist+s+way+week+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_6018e4b498c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_5fd38ef54ed8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60138bd07beda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fcef0215ed6e.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/penyelesaian_arbitrase.pdfIn PDF document text
    • http://topstop.site/491542887887y3pk.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://daravto18.ru/898998632869b1th.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/67424896939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fdbff79408f4.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/gomaxod/jukamefuji.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/pioneer_mixtrax_fh-x720bt_reset.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/yaseen_sharif_for_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5e6554-b80e-49ac-9279-d5c343620a1c/resistance_training_exercises_without_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01520f5-0bb8-4ec3-9a68-2b470c8fa521/daberasafalijeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0b33ab-2352-4e5c-903c-9f09a3a26266/what_is_economic_development_in_local_government.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/9890001297.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/7856333131.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/12732404044.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/zuvefetukifo.pdfIn PDF document text
    • http://dafuwinev.myartsonline.com/lumajiwijugojumixejezuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1f01e1-5cf1-4fc3-a4bc-8dc8e4bec4b7/89194231281.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/what_does_it_mean_when_my_car_says_service_engine_soon.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/vuteselomawizobaneni.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/18375928467.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/tifepuzerujomogaxutim.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_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 5356 bytes
SHA-256: 6a63887f2eb51d17fd74418c71e3864ad1bf8a6148808aeb8f26bb87d310e548
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10640 bytes
SHA-256: ae94573a6a7b56adca3eca96d27d9920628a89dd26a7770adf22c3431d809ac1

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