Malicious PDF — malware analysis report

Static analysis result for SHA-256 88098f559536ecf5…

MALICIOUS

PDF

69.5 KB Created: 2021-03-18 13:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05dbc28b2cd6e9cee5186bfebcebd0d4 SHA-1: e9c5b0805e164d8f7ac6e574f6e6021aa42fb815 SHA-256: 88098f559536ecf5486e3f73a6938bc1ced9f1c88e495e80991da3df5ce3496d
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 are SEO-focused, indicating a potential link farm or phishing lure. ClamAV and ML classifiers flagged this as a phishing/malicious PDF. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=c%252B%252B+loop+through+string+array
    • https://cdn-cms.f-static.net/uploads/4501645/normal_6044fb36ed5ee.pdf
    • http://vivekawiga.sportsontheweb.net/health_psychology_biopsychosocial_interactions_9th_edition_citation.pdf
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/fezolowivukev.pdf
    • http://wufonidovo.22web.org/50943762704.pdf
    • http://rukunikuxajosog.22web.org/51888346928.pdf
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/nexofib_tetibiwizob_bakuridim_lupilasibini.pdf
    • https://cdn-cms.f-static.net/uploads/4480905/normal_603bac1a362b2.pdf
    • https://cdn-cms.f-static.net/uploads/4390383/normal_60145465dfbb1.pdf
    • http://leporabev.mywebcommunity.org/schema_analisi_periodo.pdf
    • https://cdn-cms.f-static.net/uploads/4369518/normal_604e68605f9c0.pdf
    • http://kirakexig.mypressonline.com/27749838319.pdf
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5fcaad1a2aecc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_5d81f34930ee45838f2d74a152cc9c9a.pdf?index=true
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_f7d906f9bdba48d894410f73f1f38a46.pdf?index=true
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_8cd6bad1a0964153ba4438b033bde102.pdf?index=true
    • http://bavidoripo.epizy.com/82057354583.pdf
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_b0c98576d32248729cd991f77b3f6ec7.pdf?index=true
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_7be33769596f4651baa419d7ad45ab19.pdf?index=true
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_4429ad6ca1dc4c4a9b43d0dcac7037dc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf19.bin
47909df08a508b4b7da87f2cdb5ac1a78e6077aa5e3d671df245207013af2635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 5088 bytes
font_01_sfnt_off0000e063.bin
5d29013d27576279de72d2b52454477cf2afd508e89c9b6d94952d3aaa5c4c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 11900 bytes

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