Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c61906a06b151e4…

MALICIOUS

PDF

110.9 KB Created: 2021-02-22 01:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8e3503bea7231a19c622c05b354550a5 SHA-1: c0528271467be7d24b45d9edc8cddca976afe6b1 SHA-256: 5c61906a06b151e42cbc2545ca2e0f0333c18fffd732cef6dcb1133b5f45f0c3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to Weebly and other domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this conclusion. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=roland+td-6v+manuale+italiano PDF link annotation
    • https://depewezuluro.weebly.com/uploads/1/3/4/1/134108544/siritesaz.pdfIn PDF document text
    • http://winoorama.site/593221784327zxn8.pdfIn PDF document text
    • https://kujiguvasate.weebly.com/uploads/1/3/4/5/134584602/3ea32fc8eabe.pdfIn PDF document text
    • http://soluzixod.66ghz.com/19386389484.pdfIn PDF document text
    • http://quickpapp.online/lsat_preptest_85_answer_keyk6g9s.pdfIn PDF document text
    • http://hookup157.site/canadian_passport_application_form_for_babyazs9l.pdfIn PDF document text
    • http://rawapob.22web.org/23072070331.pdfIn PDF document text
    • http://hookup157.site/teorema_de_moivre_demostracionb6dpg.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/turanofoxaxane-vojuz-panixanuta.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/897a6f1fb0d.pdfIn PDF document text
    • http://garant-ritual.online/27103537982pqkt8.pdfIn PDF document text
    • http://vermono.site/zepiriludar.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/tuxalowafokuvo/3d_video_editor_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/sinorakikikebilex.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/tobipiganuguramonijovos.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/how_to_structure_whole_class_guided_reading.pdfIn PDF document text
    • http://vuzabog.epizy.com/association_of_legal_administrators_salary_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/kixefemuxopoderiwobanex.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/reboredakapir.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_off000176d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D0 4948 bytes
SHA-256: e999d3f2ec57aff79ffdac115c46c596995bae592a1cc2c31d453ee09fe20ba3
font_01_sfnt_off000187aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187AA 11308 bytes
SHA-256: 5a1bc10ff8b217cd345f1a3434f4dd5bd65dce0168523d1521572ffd540d87f3

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