Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef18a44efaade606…

MALICIOUS

PDF

79.7 KB Created: 2021-02-26 07:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a04e4d17109ec8f5710c7a613315165 SHA-1: 56739a0564aee85058960e8cdf7c20fc3c61fafd SHA-256: ef18a44efaade606a892bf82ee1dbc0bd8b037c53c8034c680efd3e40dff63ab
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://crophysi.ru/wix?keyword=gettube+not+working'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=gettube+not+working In PDF document text
    • http://geguxejap.22web.org/pojiburemewojomitarinajag.pdfIn PDF document text
    • http://girlsbeach.space/talking_tom_gold_run_android_1_comxf95h.pdfIn PDF document text
    • http://magicwoolshop.com/16677461891q9wsp.pdfIn PDF document text
    • http://xogataruxotaran.22web.org/welisowojuzevitax.pdfIn PDF document text
    • http://naturwow.space/hashar_movie_full_hdyy894.pdfIn PDF document text
    • http://3bureaureport.info/wubeketobarepofatowa6m0db.pdfIn PDF document text
    • http://silkhfig.bid/virginia_woolf_poetry_foundationecw5o.pdfIn PDF document text
    • http://molotkov.site/fenunirikca2y.pdfIn PDF document text
    • http://rubisteq.online/96705482250qdmsk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rudixexo.epizy.com/fodmap_grocery_list.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/10501398611.pdfIn PDF document text
    • http://vovijez.epizy.com/98838678891.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/39132698755.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/neoclassical_architecture_characteristics.pdfIn PDF document text
    • http://pewizofiwerobep.rf.gd/seximujosevabixavifig.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/wabuwisuguwerik.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/epopia_de_atrahasis.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_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 4760 bytes
SHA-256: 49dbb8bba540844e4e27cb14f76a2a39da7c7322ea6fb52e786fccbc108e5ccf
font_01_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 11260 bytes
SHA-256: 7861e231afd5c1b8c1edf7d8768b2050b7764cea0004e9910db5981c0d4d419a

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