Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24a96c4c7b21df4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-04 05:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f92a2d56357aac9550ff0ab49b603405 SHA-1: 9019b92be320573a5309d24da0beae1077f8f57b SHA-256: a24a96c4c7b21df4c678cab90d98f7f22ccb9b4046e58eb5a43b7b000a300eb7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=white+powder+gold+egypt PDF link annotation
    • http://xudogiborijum.66ghz.com/90156885332.pdfIn PDF document text
    • https://dulupuwo.weebly.com/uploads/1/3/5/3/135393712/7814b7dd7a.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/general_knowledge_quiz_for_kids_with_answers.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/how_to_lie_with_statistics_summary.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/biwalirex.pdfIn PDF document text
    • http://wivejudotimog.22web.org/chiari_malformation_symptoms_treatment.pdfIn PDF document text
    • http://nudazemuxebabu.22web.org/rukezefagot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://folizel.epizy.com/create_book_format_in_ms_word.pdfIn PDF document text
    • http://nekajisez.rf.gd/con_te_partiro_andrea_bocelli_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/format_code_vscode_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/juzugunutesudezoruwasogi.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/37311944685.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/tefivudagijo.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5040 bytes
SHA-256: 17a6fcbbb9a952e7805ec7ec11f67b6a0c0079461f8435cae6c0949c1aff523e
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10220 bytes
SHA-256: 5b5d973b46530a3720858af05c34dc86c31bce0a8621709016d4759b457566ec

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