Malicious PDF — malware analysis report

Static analysis result for SHA-256 847c29e6b54e21e0…

MALICIOUS

PDF

82.8 KB Created: 2021-03-23 12:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6472f21e49ecf02984015ae7cd9dea2f SHA-1: cebed5c597016ec48407766f555688c0b277c827 SHA-256: 847c29e6b54e21e0fc3c86024006480bd6071aaac6149710ea711f00e26d79da
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a keyword search term, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=alimentacion+parenteral+enfermeria+pdf PDF link annotation
    • http://ropukejak.22web.org/8681294015.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/alcohols_and_phenols_ncert.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/75193724939.pdfIn PDF document text
    • http://gubevexezu.iblogger.org/70257326738.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/abviewer_enterprise_to_dwg_converter_for_pc_full.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/woxewebamusoraxif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepetixapokurob.myartsonline.com/agri_annual_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6b50b0-b280-4a5d-be8d-5f8ac3278dd9/strategic_management_question_paper_2017_mba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32585278-83de-4028-816c-67a49edbeb19/65567614159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cbe0aa-b5db-4cda-9ab3-9642c300516d/todulofujuduzoxud.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/idiot_s_guide_to_football.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/ap_human_geography_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/tekugowilabifiguzedote.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/jipitamubugupebaranem.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/jinisojejelidizadinupafab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134db121-a639-4025-ae2e-559ad9395f3a/87549213331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9793198-b4ae-448d-906a-250bdfe3924f/what_does_the_yellow_triangle_on_my_dashboard_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/bible_commentaries_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31fca2b-6348-421b-ab24-456b0aab7e03/68969018108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64294e2b-9ad4-4f52-8e50-2f51a611df72/what_is_meant_by_quality_in_project_management.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_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 5112 bytes
SHA-256: f876ddb5b8a895389161aebe02ba95c5a6695ef5be85fc35c0bea86886f457a4
font_01_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 11940 bytes
SHA-256: 514948fc5c39493bb2af2104e65c3f796627748650b06fd0a90af9b2bdfb2209

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