Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e0da298eb3dc1…

MALICIOUS

PDF

73.8 KB Created: 2021-05-19 23:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 478211f6c473066daee59eb7c6aabdd9 SHA-1: ed2d9abc30b11e607996042923afd7adff415d97 SHA-256: 404e0da298eb3dc1292029c1014ca5ce5b46506ee02c7f68e8f7d56aca042a9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse tactic. The primary malicious URL identified is https://seumenha.ru/strik. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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://seumenha.ru/strik?utm_term=articulos+definidos+e+indefinidos+en+espanol+ejercicios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479446/normal_600ef651015e6.pdfIn PDF document text
    • https://pusenosegunilo.weebly.com/uploads/1/3/4/7/134705238/donedakifajutan-tukutumedar-titikuto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5ffe67876403e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_60310b17da81f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5fccf3e1db348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_602baa1230848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5fdfad9da0cce.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/jaziva.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/4f295de3d.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/cc806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_6058300682b3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5ff15515b4d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_603ab81cda6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_605232f890e56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ffbc87c7354a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_6012cb07d9f1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5feeaac919bd8.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/davolazupivowi/how_to_adjust_hands_on_g_shock_ga_100.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/lagu_yang_terdalam_fatin_feat_ariel.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/brahmani_mata_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/ali_artwork_hausa_comedy.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/lefuxekofezosuvijawomuwow.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/a_little_life_brief_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/ordering_rational_numbers_worksheet_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/niporogosurefebiliku.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/44771616049.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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 5212 bytes
SHA-256: d4d4bc396599a0e5929b2c50649e96cb2a69b6579efa71e058299b904ce7ee21
font_01_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 11528 bytes
SHA-256: 9be9560c186ade0304a65297d5056fbc5d61e0f0e70607d7696332dc338ba512

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